Weird display issue

[sahanlak]

Hello,

I'm using an 21.5 iMac with 10.6.6. I'm having a weird display issue. Check the attached screenshots

I didn't install any new apps except the new update which installed mac app store.

Any idea?

 

[stridemat]

Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 3_1_3 like Mac OS X; en-us) AppleWebKit/528.18 (KHTML, like Gecko) Version/4.0 Mobile/7E18 Safari/528.16)

Do you access to an external monitor? By attaching your iMac to it and see if the problem is rectified.