I've posted about this before even taking one piece of advice and calling Apple Care even though it had expired. The problem arises when using the mouse, mostly in scrolling in Safari and email but this last time using Aperture. Suddenly a pukey green screen with fine lines. AC instructed to reset the PRAM which I've done. Then I reinstalled Lion on my iMac
2.66 with 4gigs of RAM and was proceeding merrily along and the green screen appeared and I once had to do a hard reboot. I've even swapped out keyboard and mouse and reset the PRAM. (AC suggested waiting for three full chord sounds before releasing the keys adding they didn't think it was a kernel panic but offering no other suggestions.) All software up to date, 10.7.4 and Safari 5.1.7...can anyone please add some insight into this.
Thanks in advance.

Maybe try an SMC Reset for your Mac model:
Intel-based Macs: Resetting the System Management Controller (SMC) (http://support.apple.com/kb/HT3964)

Also, maybe try a cold boot using the 'Safe Boot Mode' and see what happens or any improvements.

http://i.imgur.com/VRkGm.png

did you try this back in march when i initially suggested it?

Nope haven't tried that but thanks all for your input. I'm waiting for Mountain Lion, do a complete clean install 'cause all tests, TechTool etc. show no hardware problems.:D

I wouldn't hold your breath if I were you and why would you suppose that a Mountain Lion install will magically fix your problem????

Maybe try and do some of suggestions that have been suggested!!

Sounds a bit like the horse/Ass and the water drinking story. ;)

The point is to avoid doing a clean install with Lion and taking up a lot of time reloading programs afresh when ML is just around the corner and seeing as (if you really read the post) all indications are that it is not a hardware problem. Perhaps, if you buy me an external monitor I'll give that suggestion a try. In the meantime you might try a clean install on your attitude while posting as your current one reeks of smarmy and arrogant.

No smarmy comments intended and I did read that hardware tests pass, but it seems that you haven't even tried some of the suggestion posted. Why not??

Here's some other suggestions:
- Boot you iMac from another proper working Mac using Target Disk Mode and see if the problem still exists.
- And or try the converse arrangement booting another Mac with your iMac in Target Disk Mode.

- Create two 10GB partitions with Disk Utility and install Snow Leopard on one and Lion on the other, update both when booted from the new test "clean Install" partitions, and test to see if the problem still exists.

Do you have or can you get access to an external monitor so you could just use it to test if the problem still exists??

"but it seems that you haven't even tried some of the suggestion posted. Why not??"

You might as well post in caps...now you've got a demanding tone.
Who do you think you are? Please refrain from any further posting to his query.

You post a problem, ask for help, ignore the best advice you are given, then months later post the same question again asking for help and then again ignoring the fundamentally sound advice youve been given yet again...can you see how that would be frustrating for those trying to help you?

You come across as being pretty cocksure, but you don't seem to have much of a grasp on anything even close to basic troubleshooting theory..if you did you would understand that a)it's extremely unlikely that the same "software problem" would persist after a fresh install of the os b) software problems are not likely to result in the condition you describe c)diagnostic tools like techtool often arent even worth the media theyre pressed on and d)the best way to start to isolate the problem would be to take the proffered advice re:an external screen and, depending on what you see, booting from a known good os


Until you try one of the solutions offered you're simply wasting your own time and the time of everyone trying to help you.

Well SmudgeTheCat, and maybe your handle is appropriate when dealing with Mac problems, and I have no idea where you get your ATTITUDE from but I sure don't appreciate it, nor broad it seems, and I'll be quite content by considering and obliging to your request to no "further posting to his query", whatever that "his" part refers to, nor any other future "help" questions you may have in the future.

Besides your Mac problem, I think you just might have some other problems you might want to get fixed!! ;)