Hey, I'm running KDE 4.2.2 on Kubuntu 9.04 on my iMac G5 (yes a PPC ). Shortly after my installation I noticed some weird graphical glitches and since then they have stuck... Basically, the taskbar, folders, and icons, have messed up colours. Blue becomes orange and orange becomes blue. Here are two examples:

http://img96.imageshack.us/img96/3819/glitchq.png
http://img96.imageshack.us/img96/3525/glitch2.png

Any ideas? Thanks

Moved to Linux.

You may wish to check your X driver configuration as that is the likely cause of the issue.

How do I do that/how will I know what is wrong with it?

It is possible that your system requires special options added to xorg.conf to function correctly. Also, disable desktop effects if they are enabled. Googling will likely inform you of the needed options.