Dell OptiPlex 990 Service Manual page 78

Memory address line failure at address, read value expecting value
Description A memory module may be faulty or improperly seated. Reinstall
the memory modules and, if necessary, replace them.
Memory allocation error
Description The software you are attempting to run is conflicting with the
operating system, another program, or a utility.
Memory data line failure at address, read value expecting value
Description A memory module may be faulty or improperly seated. Reinstall
the memory modules and, if necessary, replace them.
Memory double word logic failure at address, read value expecting value
Description A memory module may be faulty or improperly seated. Reinstall
the memory modules and, if necessary, replace them.
Memory odd/even logic failure at address, read value expecting value
Description A memory module may be faulty or improperly seated. Reinstall
the memory modules and, if necessary, replace them
Memory write/read failure at address, read value expecting value
Description A memory module may be faulty or improperly seated. Reinstall
the memory modules and, if necessary, replace them.
Memory size in CMOS invalid
Description The amount of memory recorded in the computer configuration
information does not match the memory installed in the computer.
Memory tests terminated by keystroke
Description
No boot device available
Description The computer cannot find the floppy disk or hard drive.
No boot sector on hard-disk drive
Description The computer configuration information in System Setup may be
incorrect.
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A keystroke interrupted the memory test.