Computer Freezes with dotted pattern and flashing

I came back to my computer after 30 minutes away from it, and it had frozen with no ability to change applications, websites, screens, windows etc. The screen was locked and flashing bright colors, with an odd dot pattern over the screen. I restarted by manually holding the start button on the computer tower.
The seemingly identical thing also happened yesterday, which I also restarted manually. Any ideas on the problem here or potential fixes?

I'm on a MacPro desktop from early 2008.  This is what I found on my screen.  This is taken from an iPhone (the dots may be hard to see but they show up on the right side of the image:
I'm running 10.7.5
Procssor - 2.8 GHz Quad-Core Intel Xeon
Memory 4 GB 800 MHz DDR2 FB-DIMM
Graphic NVIDIA GeForce 8800 GT 512 MB
Display 23" DVI
My memory is something I have been working on...  It is nearly full only 46.21 GB free out of 999.35 GB.
Need any other info?

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