HP DC7800 - Manual (Page 240)

Computer seems to be locked up.
Cause Solution
off the power. To restart the computer, press the power button
again.
The removable hard drive has no power to the hard drive enclosure.
Cause Solution
The lock on the enclosure is not turned to the “ON” position. Insert the key and turn the lock clockwise 90 degrees. The
green LED on the front of the enclosure should be on.
Power cable from the computer power supply to the enclosure
frame is not properly connected. Check the power supply to make sure it is properly connected
to the rear of the enclosure frame.
The removable hard drive is not recognized by the computer.
Cause Solution
The removable hard drive carrier is not fully seated in the
enclosure frame or the hard drive is not fully seated in the
carrier. Push the carrier into the enclosure frame so that the connector
on the rear of the frame is properly seated. If this does not solve
the problem, turn off the computer, remove the carrier, and
check to see if the connector on the hard drive is properly
seated in the carrier.
The removable hard drive enclosure is beeping and the green LED is flashing.
Cause Solution
Fan failure alarm on the removable hard drive enclosure has
been activated. Shut down the computer and contact HP for a replacement
enclosure.
Solving Media Card Reader Problems
Table D-5 Solving Media Card Reader Problems
Media card will not work in a digital camera after formatting it in Microsoft Windows XP or Microsoft Windows Vista.
Cause Solution
By default, Windows XP and Windows Vista will format any
media card with a capacity greater than 32MB with the FAT32
format. Most digital cameras use the FAT (FAT16 & FAT12)
format and can not operate with a FAT32 formatted card. Either format the media card in the digital camera or select FAT
file system to format the media card in a computer with
Windows XP or Windows Vista.
Table D-4 Solving Hard Drive Problems (continued)
228 Appendix D Troubleshooting Without Diagnostics