I'm kind of a noob when it comes to this stuff, but the problem is my monitor flickers when the system is heated up. So long as the A/C is running and the computer is VERY well ventilated the problem doesn't occur or is significantly reduced.
The machine used to be in a SFF case, but has since been moved into a larger midsize tower. The occurence has been the same between the two of them. I've also replaced the PSU for a larger one and the graphics card.
The only things I can think of are the following:
Heat - it has 4 working fans (2 in, 2 out) and the problem is the same between an SFF and midsize case
Motherboard/Processor - only viable (that I can think of) components left to replace
Thanks in advance!