Okay. So the power source gets to the motherboard. It starts the fans, including the one on top of my cpu. BUT the cpu wont power up... This is weird, considering the last time I had it running the temps were fine.

This is a picture of my running temperatures after these problems arose.
The main problem seems to be that the cpu isn't booting up. You know the lights on the motherboard? It red lights the cpu and then never fully starts up. Whenever it gets passed the cpu the gfx card and everything else starts up and I can run it. I tried switching wires.... I tried doing w.e....
My question as to what the problem is? Is my motherboard malfunctioning? My motherboard isnt fully fastened in... it didn't come with enough screws for it. Is this the problem?
I'm honestly thinking about calling in or dropping my computer off at a tech repair place and having them fiddle around with it and figure it out....
Anybody have any suggestions or know the price for something like that?
I'VE DONE EVERYTHING. The only thing I haven't done is taken off the cooler and reapplied thermal paste (it looks like its still in the same spot as it was when I put it on, the paste doesn't decay right?).
I've switched out old wires with new extra ones (this computer setup isn't even a year old).
I don't know what to do. Please help.