TECHNOLOGY: Prepping for Bypass Surgery

Back into the hardware end of things, J’s PC (on the right) suddenly won’t go on. It’s got the worst “On/Off” button system I’ve ever encountered, a flat section on the corner that doesn’t really depress externally but rather touches something off inside, so I don’t really know if it’s the button (did check the wires and they seem okay) or the power supply. The only way to check it is with a power supply that is known to be okay (the PC on the left, whose problem I’ve forgotten but I think it was the hard drive or the monitor or some such thing). Before I go out and buy a new part, I’d first like to see what’s actually wrong so that I don’t have to purchase the whole barebones again.