iMac 2.93 GT120 graphic glitches

[stars_fan]

So for the last month or maybe 6 weeks randomly the graphics in Safari look like the photo linked below.

Any ideas what's going on? It just appears to be in Safari and if I scroll up/down then come back to the picture it looks normal.

 

[MacMini2009]

Your iMac is telling you to put on 3D red/blue glasses.

Just call Apple.

 

[stars_fan]

Thanks for not being helpful.

 

[aprofetto]

I would call Apple.