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IIe not recognizing Unidisk drive



I wonder if anyone has seen this before.  I have an Apple IIe 128k and
a Unidisk 5.25" drive.  Both the computer and drive seriously look
like they've never been used, that's how good the condition is.  The
system worked absolutely perfectly until I removed the disk drive
controller card from the motherboard to inspect it.  I put it back in
the same slot and now the system no longer recognizes the drive, so
when I turn it on, the drive doesn't spin and all I see on the screen
is "Apple //e" and a blinking cursor.  Any help would be much much
appreciated.