PC freezes at BIOS entry screen, can't do anything.

So I went to sleep yesterday and everything was fine, I didn't download anything new (besides Titanfall Beta) and I didn't move any hardware around. Today I wake up and try to turn my PC on, it loads, I hear the beep that I should always hear and then it goes to the screen which allows you to enter the BIOS. It took longer than usual so I went downstairs to make breakfast. I came back 10 minutes later it was still stuck there. So I do what normally fixes all problems related to bootup in my PC and I unplug it and take the VGA cable out (currently using my HDMI elsewhere but I don't think this is the problem). I try this multiple times to no avail.

So at this point I start to worry a bit and google the issue, I find multiple solutions but I don't know which one to choose since I'll probably end up breaking something else. Some even say they had to replace their CPU or Mobo to fix this issue, at this point I'm assuming this won't be an easy fix.

TL;DR Went to sleep, woke up, PC frozen at BIOS entry screen upon turning on, unplugged it, googled solutions, haven't found what I wanted, problem continues.

My specs:

AMD Radeon 6800 HD series
AMD Bulldozer FX-4100 Quad Core
Asus M5 A97 PRO
8GB Ram
Corsair CX500 Psu

I've got no idea what to do at this point, maybe it's a cable that's not connected properly (I can provide pictures) or something is dead (hopefully not). Any suggestions how to proceed at this point?
Note: I didn't build this myself so I don't have extensive knowledge of all the cables/parts but I know enough to get by I reckon.

I've checked the cables and from what I can see they are connected. There are two cables a PCI-E cable and an AC'97 cable which aren't but they never have been in the first place.

Excuse the dust and the cable management. But here's a picture:

I do not have a spare PSU unfortunately, yet I could try and reconnect this one?

I've disconnected my mouse, headset, DVD, keyboard etc. and tried to boot the PC (also I've only got 1 stick of RAM) and nothing happened. I'll try to reconnect PSU now.

Reconnected PSU, disconnected all peripherals and nothing still...