I fucked up

Guys help, I plugged in a hard drive from a broken laptop into my pc to try to recover files and now my pc won't even power up, does anyone know what happened or how bad it might be?

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You need to find a working PC to reprogram the firmware and bring the mainframe back online.

Did you unplug it and try again? It’s probably changed the boot order or some shit in the bios.

I removed the laptop hard drive and made sure everything was as it should be and nothing, still won't even power up.

>won't even power up
assuming it's not this, otherwise user would just get some "no os found" error

sounds like you knocked out a power cable or something while installing the hard drive into your pc, i'd check all the cables. I don't think this kind of situation could fry your pc

I checked, I unplugged and replugged the power cables and nothing.

Motherboards and PSUs should have short circuit protection in case a harddrive shorts, there's still a possibility that a shorted harddrive killed their the PSU or the motherboard, motherboard is unlikely current should be limited, PSUs usually just cut the current in case of short circuit and turn back on after powering off and on.
Did you try to unplug the power cable for 10 secs and plug again?
Also check the PSU fuse if your PSU has a fuse.

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oh, there's also a possibility the harddrive sent 12V through the SATA rails, if that's the case then the board is probably dead