8 Replies Latest reply: Mar 30, 2014 1:38 PM by Harger Smith
lips Level 1 Level 1

I have a lat 2009 27" iMac and have been using it with 8gb of ram for years. Last week I purchased 16gb form OWC took out the original ram and put in 4 new 4gb sticks. Within 3 hours I suddenly began to see blue and yellow 1/4" "spots" on the screen. They gradually spread and finally froze the machine. Nothing was responsive EXCERT my Magic Trackpad which moved the cursor but would not select anything. Thinking I had a ram problem, I took put the new and put in the old...same thing. Tried doing a reset of the PMU but it didn't work either. Now on restarts I even get the yellow spots on the Opening grey screen. Sometimes it will frizz there (cursor still moves) or goes through with the boot, only to freeze a few minuets later. (Cursor working and blue or yellow spots everywhere. ANY ideas???

iMac, Mac OS X (10.7.4)
Solved by mende1 on Mar 16, 2013 9:04 PM Solved

In that case, memory is correct, so the problem is the graphic card

Reply by mende1 on Mar 16, 2013 8:49 PM Helpful

The graphic card is damaged. That white screen appears on safe mode when the graphic card drives couldn't start properly, so OS X doesn't start. Take the Mac to an Apple Store or reseller to get the Mac repaired

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