Monitor image breaking up - crashing monitor

[jwhitt]

Whenever I use a web browser it works fine for a while then the image breaks up on my monitor and I must restart the Mac to fix it. I suspect Flash may be the problem.
I had this problem before and updated the video card drivers and Flash plug in software and that fixed the problem. Then recently I installed a new SSD drive from OWC and cloned my start up drive to the SSD which I now use as my start up drive. Now the problem is back.

http://eshop.macsales.com/item/Toshiba/HNSNC512GBSJ/?APC=READERSPC&Source=Blast12Sep

I have a 2009 Mac Pro 2.66 (MacPro4,1), 10.6.8 system. Two NVIDIA GeForce GT 120 video cards, one HP LP3065 30" Monitor and one HP 2335 24" monitor

Model Name: Mac Pro
Model Identifier: MacPro4,1
Processor Name: Quad-Core Intel Xeon
Processor Speed: 2.66 GHz
Number Of Processors: 1
Total Number Of Cores: 4
L2 Cache (per core): 256 KB
L3 Cache: 8 MB
Memory: 7 GB
Processor Interconnect Speed: 4.8 GT/s
Boot ROM Version: MP41.0081.B07
SMC Version (system): 1.39f5
SMC Version (processor tray): 1.39f5
Serial Number (system): H09313TX4PC
Serial Number (processor tray): J5927032Y4MFE
Hardware UUID: D48A0256-E177-54DB-AAFD-8C151BB490CF

Any suggestions? I could go back to using my old start up hard drive, but it is so much slower than the SSD drive.

 

[goMac]

What's your graphics card? Sounds like your graphics card may be dying.

Edit: Hm, just noticed the two GeForce GT120s. Is it just one display or both?

 

[Draeconis]

Might be an idea to remove your serial numbers and UUID from your post.

Sounds like a dying gfx card.