Originally Posted by Kaws
But everything is turning on fine , all the fans and lights .
If I don't get anymore suggestions I'll probably try testing it with another PSU . But I really don't want to have to do that .
If you have a friend that has one to lend you for an hour to test, that's all you need. If it just up and started doing this, that seems to be the logical conclusion. Or, it could be a dead video card (though I kind of doubt that). If you have onboard gfx, try that. Take your vid card out, reset your BIOS, then start it up and see what happens. If the vid card is bad, it should not be blank screen. (And the same thing; if you have another vid card to test, do it).
EDIT: Btw, you haven't logically tried a different monitor have you?
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