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Old Feb 23, 2013, 06:48 AM   #1
macuserau104
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Join Date: Jan 2012
Exclamation 27" 2012 imac - screen stuck @ 640x480 resolution

just unboxed my new 27" 2012 imac - after a 6 week wait for it to arrive.

first thing i did was run time machine to back it up on a new external 3TB HD.

it went to sleep during this and when i the screen opened up again the resolution is now stuck @ 640 x 480 i have tried all i can think of to resolve this with nil result.

i cant contact apple as it is the weekend here (australia) and have done a few searches on the net with no result

can any one help ?
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Old Feb 23, 2013, 08:42 AM   #2
harlex
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have you done a full reset
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Old Feb 23, 2013, 09:31 AM   #3
lali
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Join Date: Oct 2007
you have done the obvious steps right? settings-display play with auto or manual? I am away from my computer do not recall the menu names


if not you reset the smc http://support.apple.com/kb/ht3964?v...e&locale=de_de
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Old Feb 24, 2013, 06:07 AM   #4
macuserau104
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Unhappy more info

thanks for the help

have been using 10.7.5

mew mac shipped with 10.8.2 - tired restart, nil result

display pref only allows either:

- best fo display / scaled - it is stuck on best for built in display and if i choose scaled is back to best for built in display when i open it again
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Old Feb 24, 2013, 02:53 PM   #5
drambuie
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What's weird is that 640 x 480 isn't an available option. The smallest scaled resolution is 800 x 600. It's like you have no video drivers installed, and it's fallen back to the VGA default of 640 x 480.

I notice you mention 10.7.5. I hope you didn't install that on your new iMac, as you would then have no drivers for the nVidia 6XX GPU.
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Old Feb 24, 2013, 03:38 PM   #6
seanm9
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Join Date: Dec 2007
Location: Cape Cod, MA
Quote:
Originally Posted by macuserau104 View Post
just unboxed my new 27" 2012 imac - after a 6 week wait for it to arrive.

first thing i did was run time machine to back it up on a new external 3TB HD.

it went to sleep during this and when i the screen opened up again the resolution is now stuck @ 640 x 480 i have tried all i can think of to resolve this with nil result.

i cant contact apple as it is the weekend here (australia) and have done a few searches on the net with no result

can any one help ?
I had a similar issue, try booting from the recovery partition... if the resolution is still the same it may be a hardware failure... also if you haven't reset the SMC and Zap the NVRAM...
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Old Feb 24, 2013, 04:36 PM   #7
WilliamG
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I'd do a complete wipe of the system at this point, and reinstall the OS. Just start from scratch. Something software-wise got a little screwy, that's for sure.
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