Graphics problems?

Hey Guys,

I have a mac pro g5 with this spec
MacPro Intel 2x2.66GhzDC 1Gb/250Gb/DVD±RW/ATI X1900 1
1Gb 240pin 667MHz PC2-5300 ECC DDR2 DIMM 4
Seagate Barracuda 500Gb Serial ATA 7200rpm 16Mb Int HD 1
Pioneer DVR-112 DVD+/-R/RW Internal Drive

We have upgrade to the latest O/S about 5 months ago.
I have just started gettings wierdo grahic errors on my screen.
Take a look:

http://i68.photobucket.com/albums/i9/sleepytom18/Picture1.jpg

Any idea what this could be?

Jeez Mr Bandwidth Hog!
Do you have the latest drivers installed?
The ATi card is known to do these things. It can get clogged with dust or just simply overheat or something and leave artifacts.
I will have to look into it to see if you have a first gen or second gen video card. The first gen was more prone to this problem. In the meantime, take some canned air to the fan and see if that clears the problem.