Computer issue - green/purple pixels in videos before and after rendering and bios shutdown

I built a new desktop for editing video during the summer. In the past week or two I've encountered some serious issues.
Ex. A: http://farm9.staticflickr.com/8476/8374160517_0bb791f218_c.jpg
While editing in Premiere or AE CS6 I've been getting these weird lines appear randomly. If I close the program and re-open it, it'll disappear, and sometimes reappear at another point in the timeline. Really strange. I also have active backgrounds enabled and green or purple patches of pixels will sometimes appear. If I tell windows to go to the next background, the pixels usually go back to normal.
BIOS blue screen shutdown
I could be watching vimeo or youtube or doing video editing and suddenly get a shut down error. It also happened while playing the CRYSIS demo, although I had a perfectly smooth experience until that happened.
Here are my specs:
Windows 7 home premium
MSI 7751 mobo
Intel i7-3770S 3.10GHz
16GB G.Skills Ripjaw RAM
NVIDIA 560 Ti 1GB
500w PSU corsair
WD 1TB caviar black HD
Asus xonar audio card
128 GB sandisk SSD
Do you guys think this is a graphics card or PSU issue? My computer is next to a metal cabinet, but has plenty of room for air ventilation. The graphics card and CPU temps have generally been between 30-40 degrees Celsius, and always under 50 C (even when rendering), so I doubt overheating is an issue. Checked with HWMonitor.
ESET Nod 32 doesn't detect any viruses

>suddenly get a shut down error
What is the text of the error message?
Read Bill Hunt on BSOD http://forums.adobe.com/thread/772169
My best GUESS is that you have a power supply problem
>NVIDIA 560 Ti 1GB - 500w PSU corsair
According to some notes I made http://www.pacifier.com/~jtsmith/GPU.HTM the 560Ti draws 170 watts
Use the Power supply calculator http://extreme.outervision.com/index.jsp (the PRO version has more options) to determine your power supply needs
Even if the calculator says you are "somewhere" under 500 watts, you MAY simply have a "weak" power supply

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Sorry for a delay in reply!
Well no, i never solved it, I've since stripped the machine and tried to see whats going on, and everything seems perfect.
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Computer issue - green/purple pixels in videos before and after rendering and bios shutdown

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