POST Messages |
Error message |
Probable Cause |
Recommended Action |
Diskette
Drive A or B Error |
Drive A: or B: is
present, but fails the BIOS POST diskette tests |
1. Run Setup.
2. Replace the signal cables.
3. Replace the drive. |
Extended
RAM failed at offset nnn |
Extended
memory not working or not configured properly |
1.
Replace the memory modules.
2. Replace the system board. |
Failing
Bits nnn |
nnn is a map
of the bits at the RAM address which failed the memory test |
1. Run Setup.
2. Replace the system board. |
Fixed
Disk 0 or 1 Failure |
Hard
drive is not working or not configured properly |
1.
Run Setup.
2. Replace the signal cable.
3. Replace the hard drive. |
Fixed
Disk Controller Failure |
Hard drive is not
working or not configured properly |
1. Run Setup.
2. Replace the system board. |
Incorrect
Drive A Type |
Type
of diskette in drive A: not correctly identified |
1.
Run Setup.
2. Replace the diskette drive. |
Invalid
NVRAM Media Type |
Problem with NVRAM
(CMOS) access |
Replace the system board. |
Keyboard Controller Error |
Keyboard,
I/O keyboard controller (on system board), or mouse error |
1.
Replace the keyboard.
2. Replace the mouse.
3. Replace the system board. |
Keyboard
Error |
Keyboard, I/O
keyboard controller (on system board), or mouse error |
1. Replace the
keyboard.
2. Replace the mouse.
3. Replace the system board. |
Operating
System Not Found |
Operating
system cannot be located on
either drive A: or C: |
Run
Setup. |
Parity
Check 1 |
Parity error found in
the system bus |
1. Run Setup.
2. Replace the memory modules.
3. Replace the system board. |
Parity Check 2 |
Parity error
found in the I/O bus |
1. Run Setup.
2. Replace the ISA board (modem). |
Real
Time Clock Error |
Real-time clock fails
BIOS test |
Replace the system board. |
System
Battery is Dead |
RTC
battery is dead |
1.
Replace the RTC battery.
2. Run Setup. |
System BIOS Shadowed |
System BIOS copied to
Shadow RAM |
Status message. No
action required. |
System
Cache Error |
RAM
cache failed the BIOS test |
Run
Setup. |
System
CMOS Checksum Bad |
CMOS is corrupted or
modified incorrectly |
Run Setup. |
System
RAM Failed at Offset, nnn |
System
RAM failed |
Replace
memory modules. |
System
Timer Error |
DMA, timers, etc. |
Replace the system board. |
UMB
Upper Limit Segment Address nnn |
Displays
the address nnn of the upper limit of Upper Memory Blocks, indicating released
segments of the BIOS |
Status
message. No action required. |
Video
BIOS Shadowed |
Video BIOS
successfully copied to shadow RAM |
Status
message. No action required. |