Currently Being ModeratedNov 17, 2012 3:05 PM (in response to kahunah)
Hello, let it cool down good & see if you can install & get these.
Have you blown the dust out lately?
Get Temperature Monitor to see if it's heat related...
And/or iStat Pro...
Currently Being ModeratedNov 17, 2012 3:21 PM (in response to BDAqua)
It was doing the same thing (White background with about 5 vertical stripes) when cold (off for multiple days).
Not sure if it is driver related or GPU problem.
When I booted into safe mode (before attempting to reinstall OS), the screen looked fine. Colors were good, and no wierd pixels.
I'm back to attempting to reinstall the OS. I get to the screen where I choose the language, but even on that screen I have lots of wierd pixels showing up (except on the on-focus dialogue box -it was clear until I made the choice to continue).
I don't think this problem is heat related (due to the same screen when cool).
I can't install any utilities until I get an OS back on it.
Currently Being ModeratedNov 17, 2012 5:09 PM (in response to kahunah)
One way to test is to Safe Boot from the HD, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, Test for problem in Safe Mode...
PS. Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive
Reboot, test again.
If it only does it in Regular Boot, then it could be some hardware problem like Video card, (Quartz is turned off in Safe Mode), or Airport, or some USB or Firewire device, or 3rd party add-on, Check System Preferences>Accounts>Login Items window to see if it or something relevant is listed.
Currently Being ModeratedNov 17, 2012 5:33 PM (in response to BDAqua)
I'm still trying to reinstall the OS. The screen is heavily pixelated (for lack of a better term -it has artifacts all over it). I can still kind of make out "preparing installation" (see images) and the cursor is the rotating rainbow. --Been like that for about 2 hours.
Currently Being ModeratedNov 17, 2012 5:43 PM (in response to kahunah)
It doesn't look like safe Mode will even work, not sure but I suspect the Install Disc uses the Safe Video drivers.
Something is terribly wrong with you Video card it seems. Possible it's RAM though, especially if your iMac has Intel Graphics.
Currently Being ModeratedNov 17, 2012 6:49 PM (in response to BDAqua)
I tried pulling the memory indivudually, no change.
Are there any boot utilities that I could use to delete the partition on the hard drive? Then I could try to reinstall.
Might be time to contact Apple. I don't know how old the computer is. (it's a clients) -I have heard something about Apple standing behind the video problems, but will have to verify.
Currently Being ModeratedNov 17, 2012 10:59 PM (in response to kahunah)
If you don't know the model, find the Serial# & use it on one of these sites, but don't post the Serial# here...
How to find the serial number of your Apple hardware product...
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