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. |