Imac's Display Changes Colors

Hi, I have an Imac G3/600mhz/CDRW/256mb/Snow. The Imac's display will change between different color hues varying from red to blue and yellow to green. When I smack the side of the computer it goes back to normal colors and then it will mess up again a couple minutes later. What could the problem be, could it be a simple loose connection, the pram battery, or something more serious. Any help with this issue would be greatly appreciated.
Thanks,Aaron

Hi,
will it overwrite the first update I did and take its place?
Basically it will include all the updates since 10.6 base version of Snow Leopard.
Sometimes doing this corrects hard to trace issues (and is less destructive than removing the SystemPreferences.plist in this case that holds loads of info)
Somewhat considered by some as Old Fashioned Repairing Permission with Disk Utility may help (Applications/Utilities > Disk Utility, Highlight the drive/Boot Vol and First Aid tab.
After doing both of those I would consider a PRAM reset.
Shut down the computer.
Restart it holding down APPLE(or ⌘ )ALT(⌥)+PR Keys until you have heard three Start Up Bongs.
This resets some of the settings the computer has.
(System Volume output and such that can easily be reset)
10:39 PM Monday; April 5, 2010
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