Dell Optiplex 390 Diagnostic Code 3

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Dell Optiplex 390 came in with a no boot complaint. Got diagnostic light 3 and blue power led followed by immediate shutdown. Did the usual diagnostic procedures: different ram, psu, fan, unplugged all non-essential connectors. After all this, and some google-fu, I came to the conclusion it was a bad motherboard. Got the new mobo in from Dell; same problem. Now banging head. Tried everything again, including putting the CPU in a different machine. Same conclusion; bad mobo number 2. While on the phone with the Dell tech, for some reason, I thought to try a different power button harness. Don't ask me why I thought to do this because I have absolutely no idea. Pulled a power button harness from another machine (Optiplex 3010 waiting in the lab for delivery to customer), plugged in the harness, damn thing booted right up. Dell tech couldn't believe it, engineer couldn't believe it. They are sending me another mobo and complete front panel assembly with all harnesses

Опубликовано:

9 сен 2024

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Комментарии : 90

@LincAvenue 7 лет назад

If I tell you how many of these machine I toss in the trash, you wouldn't believe. Thank you for this presentation Loring.

@michaelowusufrimpong3012 Год назад

Thanks for the update. I faced the same problem and your solution really helped me out. My Dell Optiplex 390 is now working perfectly without shutting down automatically. You're a GENIUS

@sko547 10 лет назад

Thanks for posting this!! I changed the psu then the motherboard without success. I was at my wits end until I saw this video. I changed the button and voila!! It works!! Thanks again!!

@abhisheksinghal2745 10 лет назад

Thanks a lot, they told to replace PSU which costs 2400 INR, decided to try myself, started googling, came across your video, mannnn! your solution WORKS, but i did something different, step-wise, 1. press power button & then un-plug the power button cable from motherboard 2. ran diagnostics (gave power button cable failure) 3. exit & it re-booted into system 4. after completion, re-plug power cable 5. restarted system 6. after completion, shutdown now power on as usual :-)

@normanblack3880 5 лет назад

I ran into this same problem on two Dell Optiplex 3010's. Changed motherboards etc., etc. I finally discovered the power button problem myself just before seeing this post.

@mrkleen340 11 месяцев назад

Yes, it's probably concerning that I am finding this video helpful in 2023 for this model but the power button swap did the trick. Saved a lot of frustration!

@Major-Fsharp 4 года назад

Its 2020 and you just saved me a headache. 100 points for you, 0 points for DELL's INFERIOR Power Switch. Thanks man

@Fetus2024 5 лет назад

Got same problem here thanks to this video. I fix my pc. I disconnect the front usb and change the batery. . Its working now

@bestogh4670 Год назад

Thanks Loring Preston. Your suggestion worked for me. Keep it up Bro.

@jcstechnology 10 лет назад

Just wanted to say thanks. Never would have thought of power button. I did the same as you, swapped buttons with an Optiplex 3010 and boom, it boots. Good stuff.

@RFnS 4 года назад

This worked for me, so glad I did this 1st before changing MB! Thanks!!

@nikolaospapa4 9 лет назад

Thank you very much for this! Saved me a huge amount of time!! All the best mate!

@xarguelles8550 5 лет назад

Thank you so much!, It worked for me on other model.

@tlachta 10 лет назад

Same problem here in ireland. Dell tech support were no help, they said the power supplys that I was using had 2 high a wattage... idiots. But i discovered that unplugging the power button cable and setting it to boot on power restore did the trick (found your video afterwards) sadly the power button is not available to buy in ireland, even on ebay uk, so i tried to use a new power button, leaving the power button LEDS connected and its doing the same thing, so its a bug with the led lights the causes the problem

@adelacuesta 4 года назад

Same thing happening with Optilex 990. Even bios diagnostics pass but will shut off before booting. Also powers on by itself. Never thought of this. Thanks a bunch!

@wepcorpc-systemsulimitedwe54 10 месяцев назад

Yes. I am facing a similar problem with a 990. Am trying out his solution and I see.

@actrungoan4725 Год назад

You are saving my life, thanks alot!

@eloymarcelo2578 2 года назад

Thanks Bro, I also am pulling hairs coz of this issue. I thought it was the PSU and have changed it. Luckily to come across your video. I'm gonna try this with another optiplex power button. Will comment later. Thanks Bro

@ngtflyer 9 лет назад

Thanks for this info! So far I have not encountered this issue but I see a lot of these in my field of work so it's very good information to know to help keep these in production and out of the landfills or from being cut up. I have a 790 myself and it works as if it were new.

@smorfnimda 4 года назад

Thank you sir! Thought I got a bad board, it was in fact the power button!

@user-jf7qh1xb8f 6 лет назад

I encountered the same problem and I noticed the system behaves the same way when plugging AC connector and pressing the power button - the brief one-second power-up followed by immediate shutoff. I concluded it's BIOS setup problem. Go to BIOS setup while booting : F2->Power Management->AC recovery, select "Last state" and Optiplex will boot normally from now on.

@daveosland3199 Год назад

Thank you! I had the same situation and same fix!!!

@akuhnert 9 лет назад

Just encountered this power button issue on a 390 minitower (appeared 1 month after 3-yr warranty expired). Thanks to this video, instead of junking the PC, I removed the power button and was able to power on the PC by using a screwdriver to "jumper" the two power pins. The replacement power button cable is available at Newegg.com for $14.99.

@LoringPreston 9 лет назад

That's awesome they're on newegg. I didn't know that. Thanks.

@ronaldzettlemoyer7397 6 лет назад

Do you have a part # ?

@timothyflanery5237 2 года назад

Thanks. It actually applied to my issue. Problem solved.

@mannyyabar7659 7 лет назад

This fix my problem. THANKS, BIG THANKS!

@rp8505 5 лет назад

Thank You so much! it worked for me. Many Thumps up

@nizam498 8 лет назад

a costumer come in my shop dell optiplex 960 give orange light 3 or 4 time , i replace the power supply , the problem is solved, the system give display, what u said bro

@irocjuno8358 5 лет назад

Thank you for your video I too had a code 3 I tried just about everything from removing the cmos batt resetting the mb tested the power supply , checked bios and nothing it would boot then power off on its own and have no luck at all till I googled and came across this video so I went on eBay and found a used power button for under $5.00 , seems to be working flawlessly .. " knock on wood" :) thanks for the video , saved me time and $$$$ btw my optiplex is a 990

@irocjuno8358 3 года назад

No not at all.. I sent out for a used cable on eBay and it fixed my problem

@mikealpha6633 9 лет назад

thanks for posting . i'll try that

@brucefidler1303 Год назад

My 790 MT is doing the same thing. I replaced the motherboard, cpu, ram, graphic card, and went to 500 watt power. Still, blue light comes on, number 3 is lit, and the fans are going, but no display. Thank you for your help.

@Karimpje Год назад

Thanks this solved my problem :)

@MrIshmeck Год назад

Thank I’m hoping it’s that because I tried everything except changing the power button

@sandseasun4158 3 года назад

Thanks man. Hi five!

@jaredborne1282 8 лет назад

I am having this same issue. It boots up sometimes though. The power supply would trip. After pressing the reset button on the PSU about 10 times, it would come back on. Unplug power for a few seconds and it will do it again. Reseated the processor. Took out all components. Same issues. It could be the power supply since the rear LED doesn't turn on until I reset it a few times.

@janardhanrankhambe2120 2 года назад

Love from India

@oscarjr.belarga5871 Год назад

Thank you very much

@kenbengtson5740 4 года назад

Crazy but true. Thank you.

@cctv9794 7 месяцев назад

Thank you , i had same error i tried another three cpu and fix it ,but the main cause was cpu base pins i found the board in computer scrap the pins were bented

@9999934821 2 года назад

thanks for information

@rougeknight5739 4 года назад

Thanks bro you help me a ton

@Redirthgink 7 лет назад

Hi, one question, mine shows 12 4 briefly and then 3 just like yours did when you got it to post is thas the normal sequence it's supposed to show on bootup?, do lights only indicate failure if they stay lit?

@teckygirl1954 9 лет назад

Thank you for posting this. Dell already swapped out the power supply for me but the issue reappeared within a week. I want to try your suggestion before they send me a board. Would you be able to tell me what replacement part I should order? I'm assuming I have to get it from Dell.

@deviantmontejo3524 6 лет назад

Thanks, works for me.

@kem9x 4 года назад

Thank you!

@joel_himself 2 года назад

Well my dell optiplex 390 does not do a POST it only power on and show a 1 on the diagnostic led and beep I have bought new ram and I don’t know what to do

@loldogish Год назад

What if it won't power on and its blinking orange? Green power button not on in back

@HighSpeedPursuit1 10 лет назад

I hope I am as lucky. I have a 390 mini tower that will not power on. I do not get the 3 error when I try to power on normally. I do however get the 3 when I hold down in the reset button that is on the power supply. I have ordered a replacement cable, not sure if it will fix it.

@editsbyhuan5643 Год назад

i know this is 9 years ago but did it fix it? haha

@HighSpeedPursuit1 Год назад

@@editsbyhuan5643 I wish I could remember

@50rbrt 6 лет назад

same problem here,sprayed the power button with electrical cleaner the it worked..

@50rbrt 6 лет назад

I'll probably need a new power button how do go about getting one .

@idhamproaqw98 7 лет назад

The power button wire check it........i check mine and its look like the wire were loosen or something(the power button wire are really stuck at back at the power button after you open the disk reader and the hard disk...)So simply put its the wire issue...

@j.miller2906 4 года назад

My pc is shutting down and on again with no warning or error. Replaced power supply, same issue. How will I know if its the motherboard?

@Djaenk 7 лет назад

This might be a little different from the topic of the video, but could you possibly provide the measurements of the motherboard? I am trying to find out what the form factor is for this motherboard.

@srdavis4619 4 года назад

Hello, I got the same pc, but I have a problem the on button light ambar and in the motherboard light code 1, I can turn on de pc

@Castor2552 4 года назад

I was looking to take the mobo for another PC and it seems like the Dell mobo are not standard as the dell power button or fan or front panel. What a pain.

@jvcmercado 2 года назад

How much was the mobo and power button?

@someshmegalamane 3 года назад

Sir I have a doubt can we replace that cpu fan and that steel thing with the normal fan Pls I have this doubt from many days😇

@shavezansari4176 5 лет назад

Thanks

@peleoseikrom 5 лет назад

wow thanks very much i was going to get a new mother board

@predikeblade3676 3 года назад

Thank you the video. But I dont understand what happened with my optiplex 390. If I push the power button nothing happened. No lights in front of the computer. If I push the power supply test button, (the little black button at the back of the computer) and I hold it, the CPU fan is working. If i take away my finger no working. But now if I push the power button harder...it is working...but 4 seconds later stopped! I tried now--> if I remove the power button's connector from the motherboard, then it is working contantly. And The front lights show: 1-2 after 1-3 after 2-3....oh my god.. :( What is your opinion? Anybody can help me?

@sumairejaz7277 4 года назад

so code 3 was hard drive not attached or found hmmm ???

@EastAngliaUK 6 лет назад

will try that i just got 5 really cheap £10 each 4 work but one does not.

@masonpmarsh 8 месяцев назад

Why is the pc warping

@mortalkombatmm 10 лет назад

Nice!! But I have another problem, when i put the power on the PC, it works first time like every model But when the first step done, the computer keeps going to start the Windows? without pressing the bottom, I Tried to change memories and PowerSpply still the same problem windows start without pressing the power bottom! ... I tried to update BIOS still same,, I tried take the power bottom from motherboard and still the same! what should I try now so the computer doesn't start the windows itself? and is it unsafe? :(

@denvergelilio2777 5 лет назад

Can i replace my motherboard w\ other brand? And what it is? Its very hard to find M.Board optiplex 390. Tia

@Tseflikas 3 года назад

2021 now and messing with an optilex 790 here, i can't believe this !!! i am having the same issue so i remove the power header and power on with a screwdriver by touching the motherboard header pins and voila !! its working perfectly now !! does anyone knows the part number of this bloody power on switch ??? any other easy way to fix it ??

@teccy3176 2 года назад

Do u think i could go to i5 2400 on a A10 bios version

@RavalOnline 3 года назад

Got Error 3 4. Research suggested memory, reseated memory and got Error 3. Swapped with a know working and confirmed bad Power supply.

@eltatolemus8727 3 года назад

que tal amigo tengo una 390 pero con codigo 1234 led azul no pasa de ahi

@SteveStell 7 лет назад

I have this same problem on my 390 Optiplex. Does it matter if the replacement switch is a SFF 3010 model? Small form? I have the regular size desktop 390. Sorry, i'm not too computer savy, but it looks like i can do this myself.

@LoringPreston 7 лет назад

Steve Stell shouldn't matter

@SteveStell 7 лет назад

Thanks man. This video helped me out alot.

@normasantana8344 4 года назад

Power button where I could order it

@stef77an 3 года назад

Whats the name of the part, so I can order one?

@jeremybrown2590 3 года назад

How much did something like that cost?

@Chris-ou6of 4 года назад

Got the same problem no booth,junk junk it.

@normasantana8344 4 года назад

Can you buy a switch boost

@codyrubash2945 4 года назад

What about 4

@eddymeza3934 2 года назад

Osea que el problema puede ser esa pieza ? Wtf

@PinderProductions 8 лет назад

I had this when I upgraded my PSU. Turned out motherboard power wasn't inserted fully.

@StepModz 5 лет назад

Happen to my 3020

@idhamproaqw98 7 лет назад

Then i dont have the damn money to buy the new one :3

@abhisheksinghal2745 11 лет назад

@zeuspunz 3 года назад

Yups, did the same thing as you mentioned and figured out that my power button/cable is the culprit. When I disconnected the power cable from mobo (after turning the PC on), never had the shutdown issue after that!