Weird parts of screen and icons turning black with white bands?

So I've been getting these weird flashes on my screen, mostly when using the internet, but also sometimes icons appear similar to the flashes as pictured below... it should be the calculator app icon but instead it's black with white streaks.
Or here's the link for a better view:
http://picasaweb.google.com/lh/photo/4ldthLn49zAmGLhSypdgog?feat=directlink
I see it mostly when loading a page on the internet... for a split second the whole frame turns black with white horizontal streaks. I tried to get a screen capture of it but it happens too fast. The whole monitor doesn't turn black, just the window I'm using.
I did a little research and think it might be screen artifacts and maybe my graphics card is going bad... but can someone confirm or deny this? Does it sound like something else? It seems to be getting worse... so I want to get it taken care of.
Any help would be great.
Here's my graphics card info... *i think*
GeForce FX 5200:
Chipset Model: GeForce FX 5200
Type: Display
Bus: AGP
Slot: SLOT-1
VRAM (Total): 64 MB
Vendor: NVIDIA (0x10de)
Device ID: 0x0321
Revision ID: 0x00a2
ROM Revision: 2060

Boot off your original G5 Install Disk while holding down Option/alt key to select AHT, then run the extended Apple Hardware Test.
It sounds like the Video card, but you might also Get Temperature Monitor - 4.51 to see if it's heat related...
http://www.versiontracker.com/dyn/moreinfo/macosx/19994
And/or iStat Pro...
http://www.islayer.com/apps/istatpro/
If you have any temps in the 70°C/160°F range, that's likely it.

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