ive had my custom-built pc for a while, it has been working well for a year or so until it started to mess-up. i reinstalled windows onto a new hard drive, this got it working again, but now as soon as the switch on the back of the PSU is on, the PC automatically switches on, but doesnt output anything to my monitor. ive tried using a different monitor and ive checked all switches are plugged incorrectly. What could be causing it to power-on as soon as i switch on the PSU? And what could be causing no output to the monitor? Cheers

Hi and welcome to D-A-L

are all the connections in the correct place