Screen image freezes but iMac seemingly still working

Hi,
The screen on my iMAC has started to freeze in the past 1 maybe 2 weeks - there is no pattern to this - seems to be quite random.
However, it appears that just the image has frozen, the mouse pointer can move over the frozen image but cannot select anything.
If the iMAC goes into power save whilst the screen is frozen, pressing a key on the keyboard brings the frozen screen image back up - so it seems as though the peripherals are communicating with the iMAC, it's just that the screen image has frozen.
It froze on me today when doing a manual Time Machine BU to an external HDD - but the BU still continued on and I waited until the ext HDD went into sleep mode which indicates that BU has finished. After a hard reboot, I checked Time Machine and the BU was fine.
Any ideas on what needs to be fixed here?

Deleting the two plist files didn't work, and the Disk Utility found no errors with the disk.
Funny thing is that when I log in as the root user - this doesn't seem to happen, I had the root user up for 4 hours today, not a problem, why? What is it about the root user that seems to be protected from this but all other users are affected after a short period? The only difference is the regularity of login, last time I used root user prior to this problem was last year, have all of the other users picked up the same problem somehow.
I don't think it's the X1600 graphics card as the screen saver animated image is still able to kick in (or is this a low level BIOS function?), the processor doesn't seem to be frozen either as the talking clock continues to read out the time, the keyboard however does not respond when the screen has frozen.
Would restoring user accounts from a Time Machine Back up taken before this problem appeared be the way to go? Any potential pitfalls with this - can I literally just restore a user folder or is there other dependent stuff that would have to be restored as well?

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Screen image freezes but iMac seemingly still working

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