Currently Being ModeratedAug 16, 2012 12:00 PM (in response to Dnomyar1956)
What you are dealing with is similar to what I am dealing with on my 27" i7 Quadcore iMac. Lion it worked like a charm. Once I upgraded to ML, all stability went out the window. It is a driver issue with the OS and I am hoping it is addressed in 10.8.1
There have been other threads about this on the 21 and 27" iMacs. I've tried all kinds of reinstalls and repairs including a clean install. It is a fault with the OS and not the hardware. Don't bother calling Apple as I did this and it didn't help. It's going to have to be addressed in an update. My current gen iMac that I listed above is so bad that I haven't even been able to use it and has remained powered off now for the last two weeks because something as trivial as media playback or cursor movment on screen isn't even able to be achieved without hiccups and skipping.
I tried a dual boot of a different OS, worked like a charm and no hiccups, so the issue is software related.
Sorry I don't have a fix, but Apple released a beta product to its customers and we are getting to be paying beta testers. Just hang in there and be patient for the update to show it's avaialble.
Currently Being ModeratedAug 16, 2012 12:11 PM (in response to BarrettF77)
As I told Dnomyar1956, that's not normal. You obviously have your own opinions about that, as you've posted condemnation of ML on multiple topics now, but you don't seem to have any hard facts, only assumptions. What have you done to troubleshoot your problems?