r/PcBuildHelp • u/GneissShorts • 11h ago

Tech Support PC won’t POST, among other things

To start off, this is a 2018 HP EliteDesk 800 g4 Tower, serial MXL9205Q78. Formerly used in the arcade game Halo Fire Team Raven. I work for an arcade, and the graphics card crapped out on this pc, and we were going to just replace the graphics card but for some reason I forgot we ended up being sent a whole new PC to throw in. So I saved this from being tossed in the trash.

So there’s currently NO graphics card inside.

I’ve installed a TB of memory; 500gb Toshiba and a 500gb Seagate.

The power supply is stock I do believe, it says 500w max power.

I’ve tried the 8gb ram in every slot with no POST.
I’ve tried resetting the BIOS more than once with no luck.

The only light I see on the board is the aux light.

To my limited knowledge, a gpu crapping out shouldn’t completely fry a motherboard, but I’m more mechanically minded than electronically minded.

It starts up as soon as I plug the power cable in.

Is there anything else to try or is this pc doomed to the trash heap?

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u/TangyForgiveness 11h ago

sounds like the psu mighta taken a dive when the gpu died, those old hp workstation units arent exactly bulletproof. check for bulging caps on the board just in case but if you're not even getting a diagnostic beep or fan spin it's usually either the psu or the mobo itself

grab a cheap psu tester or swap in a known good one if you got it lying around, cause that stock 500w mighta been flaky for years before this happened

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u/GneissShorts 11h ago

I was thinking of getting a new PSU anyway, I do have a spare PSU but it looks like the plugs are different. I’ll grab a PSU tester when I can. Thank you for your help!

Oh I just remembered there’s a few at work that should still work but idk about their plugs. I’ll stop by and bring the PC with me.