Dell Latitude C640 - Manual (Page 58)

Diskette subsystem reset failed - The floppy drive controller may be faulty. Run the
Diskette tests as described in " Using the Dell Diagnostics ."
Diskette write-protected - Because the floppy disk is write-protected, the operation
cannot be completed. Slide the write-protect notch.
Drive not ready - The operation requires a floppy disk in the drive or a hard drive in
the bay before it can continue. Insert a floppy disk, or push the floppy disk all the way
into the drive until the eject button pops out. Or,
install a hard drive in the hard drive
bay.
Error reading PCMCIA card - The computer cannot identify the PC Card. Reinsert the
card or try another PC Card.
Extended memory size has changed - The amount of memory recorded in NVRAM
does not match the memory installed in the computer. Restart the computer. If the
error appears again,
contact Dell .
Gate A20 failure - A memory module may be loose. Reinstall the memory modules
and, if necessary, replace them.
General failure - The operating system is unable to carry out the command. The
message is usually followed by specific information-for example, Printer out of
paper . Take the appropriate action.
Hard-disk drive configuration error - The computer cannot identify the drive type.
Turn off the computer, remove the hard drive , and boot the computer from a bootable
floppy disk or CD. Then turn off the computer, reinstall the hard drive, and restart the
computer. Run the Hard-Disk Drive tests as described in "
Using the Dell Diagnostics ."
Hard-disk drive controller failure 0 - The hard drive does not respond to commands
from the computer. Turn off the computer, remove the hard drive , and boot the
computer from a bootable floppy disk or CD. Then turn off the computer, reinstall the
hard drive, and restart the computer. If the problem persists, try another drive. Run
the Hard-Disk Drive tests as described in "
Using the Dell Diagnostics ."
Hard-disk drive failure - The hard drive does not respond to commands from the
computer. Turn off the computer, remove the hard drive , and boot the computer from
a bootable floppy disk or CD. Then turn off the computer, reinstall the hard drive, and
restart the computer. If the problem persists, try another drive. Run the Hard-Disk
Drive tests as described in "
Using the Dell Diagnostics ."
Hard-disk drive read failure - The hard drive may be defective. Turn off the computer,
remove the hard drive , and boot the computer from a bootable floppy disk or CD. Then
turn off the computer, reinstall the hard drive, and restart the computer. If the
problem persists, try another drive. Run the Hard-Disk Drive tests as described in
"
Using the Dell Diagnostics ."