I haven't been able to find anything on google about this, and it just started happening spontaneously, so I'm worried that I may be seeing the first symptoms of a hard drive failure. I hope someone can tell me that I'm wrong, and I've just done something stupid.
Here's the situation:
When my screen saver starts, it makes the expose 'tink' noise and the screen comes back on repeatedly (so the effect is a repeating fade-to-black-Tink!-screen comes back on...very annoying).
When I start system preferences to turn off the screen saver (or change it to a different module), preferences opens normally, but when I click on 'Desktop&screen saver', I get the 'Tink!' and system preferences quits.
I have temporarily solved the problem by going into my ~/Library/Screen savers directory and removing the module I was using (Mac3DWatch.saver). Now I can get into the 'desktops&screen savers' pane of system preferences without it quitting, but there are no modules present (even though other .saver modules are present in my ~/Library/Screen savers directory).
What is most worrying about this is that it was working fine earlier today, and I haven't changed or downloaded anything...I've just been working in Word and running iTunes. I've tried rebooting to no avail, and I'm starting to get worried.
Any suggestions would be most appreciated.