Problem turning pc on

Punkcat

Reputable
Apr 11, 2015
1
0
4,510
Basicaly when i start my computer there is a 50% chance it wont start up properly. Details of this is that it will make the usual start up noise, fans will run, my headphones and keyboards lights will work as well and it will play the windows start up noise but the monitor will stay turned off.

I originally thought it had something to do with the Motherboard or cpu but ive taken it to a repair shop and they didnt find anything wrong when they plugged it into their screen. Im pretty sure everything is plugged in properly and dont know what to do, help?