iMac 27" 2009 Graphics problems
Hi.
I'm having some weird graphics issues with my 27" late 2009 imac with ATI Radeon HD 4850.
Sometimes, the names are missing from icons on the desktop.
Many menus are corrupted, some work fine, and some are black.
Some windows are black, or mutlicoloured whn first opened but appear fine when resized.
If I reset the SMC and PRAM, all the problems disappear for a bit, but if the Mac is left for a little while they reappear.
Booting into Safe mode is ok for extended periods of time.
The Hardware test doesn't reveal any problems.
Any ideas?
If it's hardware related, how much is it likely to cost?
Thank.