This happens like every 2nd or 3rd time I turn my pc on:
so I turn it on and then everytihng in the pc turns on
but my screen doesn't pick up a signal or anything.
But if I wait like 10-20 minutes and then turn it on, it will turn on?
I get that with my second monitor, it takes a while to load until it loads to the Windows log in screen - stuff actually appears.
I believe it's your monitor as it doesn't do this with my primary monitor.