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Often the cause is a IRQ conflict or lack of available IRQs. Check the BIOS to see if a IRQ is reserved, and try unreserving one.
Try to login from another host and kill the screensaver process. OpenGL screensavers in the "xscreensaver" package will cause that problem if the X driver doesn't support 3D properly (such as ATI Rage 128).
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Last modified: Wed Jan 2 14:11:05 EST 2008