Currently Being ModeratedMar 18, 2013 4:00 AM (in response to DJChase8)
If the PRAM reset doesn't fix it, it sounds like a bad 10.8 update or a hardware issue.
Try to see if you can do a #8 here
Make sure to reboot twice so EFI takes hold as that loads first before OS X .
You can install OS X on a external drive and boot from it, see if it's not a hardware problem.
Currently Being ModeratedApr 14, 2013 8:29 AM (in response to DJChase8)
Hey Apple Community :)
I have an iMac (mid-2011, i5, 16 GB RAM, 500 GB HDD...) that is getting the same "grey splotches" during initial boot. At first I thought it was the hardware, but at one point I had the HDD partitioned (10.6 and 10.8) and thought it could have been the culprit... Here is why:
When booting to 10.6...no issues.
When booting to 10.8...distortion.
I have removed the partition, reinstalled 10.6 and completed the upgrade steps via the App Store to get back to 10.8 (thinking a fresh reinstall might fix the issue)...same problem occurs when booting into 10.8.
Short of contacting Apple Care, does anyone have any suggestions other than what is listed in this thread?
Thank you in advance for your consideration!
Currently Being ModeratedDec 16, 2013 6:13 PM (in response to DJChase8)
I just bought a used 2011 17" Macbook Pro and and having similar annomolys on the start up screen. They only appear after putting in the password when the screen goes white before the desktop appears. Has anyone figred out what is causing this and if it is a serious problem or not ? Resetng the PRAM did not fix the problem.
Currently Being ModeratedJan 9, 2014 3:44 PM (in response to DJChase8)
I have had the same issue. although when i plugged into external monitor it worked for a while. after that nothing would work.
im runngin late 2011 15" MBP originally lion, went straight to mavericks. never had 1 single issue with it since i got it until i upgraded to mavericks.
Currently Being ModeratedMar 22, 2014 9:48 AM (in response to DJChase8)
I have just begun getting this issue too. I removed a file I downloaded and it stopped. I later reset my PRAM due to another issue regarding my hidden dock and now the issue with the distorted startup screen has returned but much worse than before.