Pixilated login screen

MACPRO Dec 2006
Lion OSX 10.7.5
4GB RAM
2x3GHz Dual-Core Intel Xeon
NVIDIA GeForce 7300GT (256)
May wife has been using my old machine for a year now w/ no problems. Now the login screen & pointer appear pixilated - sometimes so badly that she can't login; sometimes login is possible but screen pixilates as soon as she clicks on anything.
I ran Onyx & zapped PRAM.
I tried another monitor.
I tried the 2nd monitor port.
I removed & resat the video card.
I replaced the battery.
Nothing helped.
I then connected to the network via ethernet cable & reinstalled OSX Lion from the Recovery Disc & updated it.
At this point the problem continued on the login screen & in her account, but when I log into the Admin account everything works fine (which I had overlooked trying earlier).
I had the thought that her acct might be corrupted, but the problem starts on the login screen.
Should I go through the trouble of creating a new account, transferring all go her files & then deleting her old acct?
OR should I just give up bring it to a Mac shop?
Thanks,
Carmen

It's taken a couple of weeks of progressively getting worse, but It's now affecting the Admin acct also.
Is it most likely the NVIDIA GeForce 7300GT?

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Genius Bar reservation
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eedaley wrote:
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I had been using my Imac lately just to run the sims 3 with extension packs which I played for about 10 minutes.
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Third attempt
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When i type in my correct password on the login screen and press enter it just goes to a blue screen for a few seconds then goes back to the same login screen again, please i need help?

When i type in my correct password on the login screen and press enter it just goes to a blue screen for a few seconds then goes back to the same login screen again, please i need help?

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Step by Step to fix your Mac
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I am a total newbie to APEX and have limited experience with Oracle in general, so please, be kind ;)
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I have had a number of issues with my Intel Mac recently and had to reboot using disk utilities, safe mode, OSX recovery, but always come back to the login screen but when I type my password the screen goes white and returns to the login screen. My password is correct and the login does not jiggle as it would if the password was wrong. Please advise,

Back up all data if you haven’t already done so. There are ways to back up, even if you can’t log in. Before proceeding,you must be sure you can restore everything to the state it’s in now. If you’re not sure you can do that, STOP.
The procedure below may spare you the need for a clean reinstallation of OS X. If you don't feel comfortable carrying it out, don't. try.
Briefly, you need to delete the following file:
/var/audit/current
If you already know how to do that, you can skip the rest of this message. Do it, and try again to log in.
Boot in single-user mode by holding down the key combination command-S at the startup chime. If you’re using an external USB keyboard, it must be plugged directly into a built-in port on the Mac, not into a hub. Release the keys when you see a black screen with scrolling white text. In this mode, there’s no graphical interface; just a command line. Initially, you can’t make any changes to files.
When the text stops scrolling, and you see a line ending in a pound sign (“#”), type the following command:
mount -uw /
You must type the command exactly as given, with no mistakes. If you don’t feel able to do that, STOP. At this stage, no harm will be done if you make a mistake, but later, it will be. Press the return key.
Next, type the following command:
rm -i /var/audit/current
Press return. You should get the following output:
remove /var/audit/current?
If that's not what you get, STOP. Type the single letter N, press return, and try again. Otherwise, type the single letter Y and pressreturn.
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exit
Press return. The text will start scrolling again, and then the system will reboot. Try again to log in.
Credit for this solution to ASC user AnthonyTW.

Pixilated login screen

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