I've tried everything
Please provide an actual LIST of what you did and what result you got (beep sounde, etc). Also provide the acual product name of mobo and installed parts.

Your image shows that the isolation layer is scraped off, doesn't have to be of any concern - exept somebody might potentially have shorted the card if that was happening during operation - or that the mobo have fallen down or being hit and taken damage from that.
 
Jul 19, 2018
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Please provide an actual LIST of what you did and what result you got (beep sounde, etc). Also provide the acual product name of mobo and installed parts.

Your image shows that the isolation layer is scraped off, doesn't have to be of any concern - exept somebody might potentially have shorted the card if that was happening during operation - or that the mobo have fallen down or being hit and taken damage from that.

What I've tried:
Resetting CMOS and replacing CMOS battery
Reseating RAM
Reinstalling CPU
Using both iGPU and dedicated GPU
Booting up with nothing attached except the monitor
Switched display cables

There are no POST codes or beeps. I'm not sure about the motherboard. All I know it's a HP motherboard from 2008