Cause A system file is corrupt, or the computer system and the system software are not compatible. Remedy Perform a clean install of the system software. Remedy Run an antivirus program to eradicate the virus, and practice virus prevention in the future. To eradicate a virus, boot the computer from a startup disk that contains an antivirus application and launch the eradication program. Be sure the virus program is compatible with your system software.
Incompatible versions can cause unexpected problems that are difficult to track down.
To prevent future virus infection, use an antivirus application program to screen all disks for known viruses. In addition, be sure that all master disks remain locked. Cause System is stuck in a loop because the Finder is having trouble with a window coordinate and is not able to draw the window on the screen. Remedy Start up while holding down the Option key. Font Won't Drag to Trash Symptoms Font cannot be dragged out of the Font folder.