My daughter has a Mac mini 2.26/2gB/160gB. It's currently running 10.6.8
Previous to a recent software update the main problems have been:

Pages: Text is invisible/cursor is invisible, the document is just white. Text is getting on there we can tell but she basically can't view anything. If you go full screen the text briefly can be seen and then the page goes black. The text can be seen in the icon for the document on the desktop.

iPhoto:All thumbnails can be seen but the pane goes black when she clicks to enlarge the photo for editing. A similar problem is occurring in iTunes with album artwork in the overflow missing and the pane is just black.

In short it's a nightmare. All these problems are still there even after updating to Pages 09, iPhoto 11 etc etc.

Is there any way I can solve these problems and are they connected? Do I need to uninstall/reinstall from original disks? How complicated is it to do?