I was trying to fix my Dad’s PS3 (he recently passed away) nothing was working, so I connected the HDD from the PS3 into my PC. Upon plugging in the SATA cable, the entire PC shut off. I unplugged the HDD, but now when I power on the PC, the fans just run at max speed and nothing else happens. I don’t know how to troubleshoot this problem.
You plugged in a data cable from the PS3s hard drive to your motherboard while it was on? That could be a problem, depends on the motherboard
Speaking of which, what’s the make/model of your motherboard?