K2500R Does not recognize its Hard drive.

My K2500R does not recognize its internal hard drive.  The same hard drive that has been in the unit for over
two years.  When you go to the Disk page everything goes in slow motion.  The data wheel takes over a minute to
move from one disk number to another.  The preset sounds and programs all work, but nothing to do with the
SCSI drives.  Internal or external. Can someone please help.
Bill

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