I can't logon my iMac since it went all blue

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walter13 Author

Level 1

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I can't logon my iMac since it went all blue

I have a late-2009 iMac 24-inch desktop using Mountain Lion.

While on a financial website using Safari, I tried to open another page and the current page went all blue.

Moving my cursor around on the page removed chunks of the blue.

Nothing was active.

After a shutdown, when I typed in my password it wouldn't respond.

After another shutdown I clicked on 'guest' and it went to the next screen but then it was non-responsive.

After unplugging the iMac for a while, it would only give me the opening screen and not let me click on my icon.

Any ideas?

Thanks…walter

iMac (27-inch Late 2009), OS X Mountain Lion (10.8.4)

Posted on Sep 1, 2015 3:05 PM

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Answer 1

Best reply

Carolyn Samit

Level 10

165,615 points

Sep 1, 2015 3:06 PM in response to walter13

A Safe Mode boot deletes system caches that may help.

Top left corner of your screen click the Apple  > Shut Down.

After your Mac shuts down, wait 10 seconds, then press the power button.

Immediately after you hear the startup tone, hold down the Shift key. You should press the Shift key as soon as possible after you hear the startup tone, but not before.

Release the Shift key when you see the gray Apple logo and progress indicator.

Once you are in Safe Mode, go back to the Apple  menu. From the drop down menu click: Restart

About Safe Mode

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Answer 2

Sep 1, 2015 5:54 PM in response to walter13

Boot into the Recovery Drive by holding down Command R when restarting.

Run Repair Drive using Disk Utility in Recovery.

This should help identify any drive issues you might be having. It's possible it will tell you to reformat your drive. Reformatting erases all data. Be sure to backup first.

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Answer 3

walter13 Author

Level 1

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Sep 2, 2015 10:40 AM in response to Carolyn Samit

Thanks, Carolyn…surprisingly my Mac opened fine this morning…but I did use your suggestion [and saved your advice for the future]…I also used dianeoforegon's suggestion to repair disk as well--no issues were found…thank you both…walter

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Answer 4

walter13 Author

Level 1

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Sep 2, 2015 10:41 AM in response to dianeoforegon

Thanks, diane…surprisingly my Mac opened fine this morning…but I did use Carolyn's suggestion [and saved your advice for the future]…I also used your suggestion to repair disk as well--no issues were found…thank you both…walter

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