My iMac 21.5" screen display at login screen only shows about a fourth of the actual screen, and displays in top left corner of screen. Any help?

When i turned my iMac (Lion OS X 10.7.2) on, the lockscreen shows up with about 1/2 to 1/4 of the lockscreen in the top left corner of the screen. It still works but is just smaller and the rest of the screen is black. Ive tried rebooting and theres nothing on the web that has a similar story. Its not a huge problem, it just annoys me sometimes. Its also done this in previous version of the OS its just continuing to do so. Thanks in advance

Maybe some of the solutions in here Troubleshooting issues with video can help.
Especially the SMC- and PRAM-reset and/or the Safe Mode.
Stefsn

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Hello:
Try resetting the PRAM and SMC.
Barry

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The following Knowledge Base article offers up some great recommendations for troubleshooting the gray screen at startup:
Mac OS X: Gray screen appears during startup
http://support.apple.com/kb/ts2570
Thanks for reaching out to Apple Support Communities.
Cheers,
Pedro.

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Phillip,
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I ended up driving 70 miles to take the Mac to an Apple Store. I think they reinstalled the (Leopard) system in some secret way, because when the mouse was frozen so was everything else and I couldn't open the disk drive to put the OSX disk in there.
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My iMac 21.5" screen display at login screen only shows about a fourth of the actual screen, and displays in top left corner of screen. Any help?

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