Computer Freezing/Weird Pixel Error

Hello! I know this looks long but I'm BEGGING for help.

I have purchased and put together my new computer about four months ago.
Everything has been fine. Well...until recently.

My computer will randomly freeze up, change colors, and flash different odd pixels.
Normally the screen would look like this http://s1270.beta.photobucket.com/user/coggysu/media/IM...

It would force me to manually power down my computer.

Well this happens normally when I have anything on Full screen mode. Such as Gaming, or Youtube.

However I finally got this issue to stop but another problem still occurs...
The screen no longer freezes, but now the computer screen makes a checkered board of pixels.
One part of the checkered board is normal video/gameplay.
The other portion is all green pixels and they wiggle around and look static like.
I can Alt-Tab out of the game and the screen will go back to normal,
and my monitor will tell me in the corner that my hdmi is plugged in again.
Windows will then tell me that the driver crashed and has recovered.
So it's a driver problem? Well I'm currently using the latest Nvidia Driver and have rolled back several times.
But this isn't fixing the problem! I have cleaned out my computer case, and have checked the temperatures of the hardware.
Everything looks fine! Worst thing about this is that since it happens so randomly I can't pin point the problem area.

To let you know, I have run MSI Afterburner and my Core clock is at 825Mhz. I tuned it down from 885 because
some people suggested that might help.

Lastly, I have playing videos and games with sli enabled and disabled...still the problem stays.

Here is a few things about my computer:

My Mother Board is a GIGABYTE GA-990FXA-UD7 AM3+ AMD 990FX SATA 6Gb/s USB 3.0 ATX AMD Motherboard

My Graphics Cards are MSI N560GTX-TI Twin Frozr II/OC GeForce GTX 560 Ti (Fermi) 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Cards

My Power Supply is CORSAIR Enthusiast Series TX650 V2 650W ATX12V v2.31/ EPS12V v2.92 80 PLUS BRONZE Certified Active PFC High

And my Processor is an AMD FX-4170 Zambezi 4.2GHz (4.3GHz Turbo) Socket AM3+ 125W Quad-Core Desktop Processor FD4170FRGUBOX

Please help me if you have any sort of hints to stop this. I have kept this computer so well maintained and I'm just
stumped on what the problem could be. I pray I don't need to replace the Graphics Cards, so if anyone has anything, please reply.