May I double confirm just bring the pc to hospital and didn't change any components?
Please refer to the following link.
Thanks for responding!
1) I called someone at home to find the document I needed. I was in hospital, the person at home browsed the PC and then simply put it put on sleep mode. I was worried that a power outage(they're common here) might ruin the PC so I told them to turn it off and unplug the PSU.
Of course, that turned out to be an ironically dumb move.
2) It was working fine when they were on it. The day I came home and turned it on, the PC wasn't returning any video input.
I'll try removing the GPU with some video assistance(never touched the components before), clearing CMOS, but as for making sure the wires/components are properly attached: they weren't moved/unplugged in the short timespan between it last working and not working.
If it's any help in diagnosing, the PC doesn't just fail to output display, but also to get into Windows(no peripheral response even though the keyboard lights up).