User switching freezes briefly on cube animation

Hi there.
My iMac has recently started freezing for a few seconds when switching users. The 3-d cube effect gets half way between users and then pauses for 3-4 seconds before snapping onto the correct user desktop. Everything else works fine. I have 80GB free on HDD. I've run hardware test, repaired permissions, cleared all the caches etc. using Onyx, reset PRAM and NVRAM and am now stumped. Does anyone have any ideas what's going on?
Thanks, Phil.
Message was edited by: Froglet

Thanks for your suggestions. It turns out that the video ram was on it's way out. Another hardware test confirmed it (strangely it didn't register a problem first time round). Totally knackered now, and Apple refuse to do anything about it. I don't think that it's acceptable for a machine that's under 5 years old to fail and be uneconomical to repair, but they say tough luck. I always thought that paying over £1000 for a quality machine would be a good investment. I had intended to keep the machine for the kids to use when I upgrade. I'm pursuing this with UK trading standards and seeking advice from consumer protection groups because I don't think the computer was 'durable' which means it should last for a reasonable length of time.

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Glen
Since my Library on my Office account is the most
complete, can I eliminate the iTunes Library on my
Personal Home User account, to save hard drive
space?
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folder on your desktop.
Regards
TD
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User switching freezes briefly on cube animation

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