Error Message Description
Memory write/read 
failure at address, 
read value expecting 
value
A memory module may be faulty or improperly seated. Reinstall the memory modules and, if 
necessary, replace them.
Memory size in 
CMOS invalid
The amount of memory recorded in the system configuration information does not match the 
memory installed in the system.
Memory tests 
terminated by 
keystroke
A keystroke interrupted the memory test.
No boot device 
available
The system cannot find the floppy disk or hard drive.
No boot sector on 
hard-disk drive
The system configuration information in System Setup may be incorrect.
No timer tick interrupt A chip on the system board might be malfunctioning.
Non-system disk or 
disk error
The floppy disk in drive A does not have a bootable operating system installed on it. Either 
replace the floppy disk with one that has a bootable operating system, or remove the floppy 
disk from drive A and restart the system.
Not a boot diskette The operating system is trying to boot to a floppy disk that does not have a bootable operating 
system installed on it. Insert a bootable floppy disk.
Plug and play 
configuration error
The system encountered a problem while trying to configure one or more cards.
Read fault The operating system cannot read from the floppy or hard drive, the system could not find a 
particular sector on the disk, or the requested sector is defective.
Requested sector not 
found
The operating system cannot read from the floppy or hard drive, the system could not find a 
particular sector on the disk, or the requested sector is defective.
Reset failed The disk re-set operation failed.
Sector not found The operating system cannot locate a sector on the floppy or hard drive.
Seek error The operating system cannot find a specific track on the floppy disk or hard drive.
Shutdown failure A chip on the system board might be malfunctioning.
Time-of-day clock 
stopped
The battery might be dead.
Time-of-day not set-
please run the 
System Setup 
program
The time or date stored in System Setup does not match the system clock.
Timer chip counter 2 
failed
A chip on the system board may be malfunctioning.
Unexpected interrupt 
in protected mode
The keyboard controller may be malfunctioning or a memory module may be loose.
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