ANOTHER PC REPAIR - NO POST  

BIOS corrupted or pch

That's a pity! You can try swapping the memory modules and processor as well. If it works without them your problems may be a faulty memory or processor. All this with the least peripherals connected, only keyboard and monitor known to be working. If the CPU and memory were changed or you know that the ones used are flawless, it could be a failing motherboard, BIOS conflict of some sort or bad component. I suppose you cleared CMOS to BIOS defaults?

@@restoredwards I will try to change the mobo, it's only a week using this 2nd hand mobo at first it was working fine, after a day not using it, it turns unresponsive

@@ja9884 whatever you think it's best for you, thank you for sharing