HP Probook 450 G2 laptop - First It Had No HDMI Output, Then It Went Dead - Can We Repair / Fix It? 

I have a repair job on a HP Probook 450 G2 Laptop - The customer showed me the laptop working but the HDMI Output for an external TV /Monitor didn't work. He uses the laptop for Karaoke so this is a big problem. I went to pick it up a couple days later once he had brought a spare laptop to use, and found it had died the day before - no power. So how hard can this be to repair?
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Richard