United States December 16, 2002
Maintenance & Service Guide
Presario 5600 Series Personal Computers
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POST (Power On Self Test) Error Messages
An error message displays if the POST encounters a problem. This self-test will run automatically each time the
system is powered on. The self-test will check all assemblies within the computer and report any errors found.
Click on the desired error code for the probable cause of the error and a recommended course of action.
Diskette Drive A or B Error Failing Bits nnn Fixed Disk Controller Failure
Extended RAM failed at offset nnn Fixed Disk 0 or 1 Failure Incorrect Drive A Type
Invalid NVRAM Media Type Keyboard Controller Error Keyboard Error
Operating System Not Found Parity Check 1 Parity Check 2
Real Time Clock Error System Battery is Dead System BIOS Shadowed
System Cache Error System CMOS Checksum Bad System RAM Failed at Offset, nnn
System Timer Error UMB Upper Limit Segment Address
nnn
Video BIOS Shadowed
Diskette Drive A or B Error
Probable Cause Recommended Action
Drive A: is present, but fails the BIOS POST diskette tests 1. Run Setup.
2. Replace the signal
cables.
3. Replace the drive.
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Extended RAM failed at offset nnn
Probable Cause Recommended Action
Extended memory not working or not configured properly 1. Replace the memory
modules.
2. Replace the system
board.
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Failing Bits nnn
Probable Cause Recommended Action
nnn is a map of the bits at the RAM address which failed the
memory test
1. Run Setup.
2. Replace the system
board.
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Fixed Disk 0 or 1 Failure
Probable Cause Recommended Action
Hard drive is not working or configured properly 1. Run Setup.
2. Replace the signal cable.
3. Replace the hard drive.
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Fixed Disk Controller Failure
Probable Cause Recommended Action
Hard drive is not working or configured properly 1. Run Setup.
2. Replace the system
board.
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Incorrect Drive A Type
Probable Cause Recommended Action
Type of diskette drive A: not correctly identified 1. Run Setup.
2. Replace the diskette
drive.
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Invalid NVRAM Media Type
Probable Cause Recommended Action
Problem with NVRAM (CMOS) access Replace the system board.
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Keyboard Controller Error
Probable Cause Recommended Action
Keyboard, I/O keyboard controller
(on system board) or mouse error
1. Replace the keyboard.
2. Replace the mouse.
3. Replace the system
board.
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Keyboard Error
Probable Cause Recommended Action
Keyboard, I/O keyboard controller
(on system board) or mouse error
1. Replace the keyboard.
2. Replace the mouse.
3. Replace the system
board.
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Operating System Not Found
Probable Cause Recommended Action
Operating system cannot be located on
either drive A: or C:
Run Setup.
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Parity Check 1
Probable Cause Recommended Action
Parity error found in the system bus 1. Run Setup.
2. Replace the memory
modules.
3. Replace the system
board.
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Parity Check 2
Probable Cause Recommended Action
Parity error found in the I/O bus 1. Run Setup.
2. Replace the ISA board
(modem).
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Real Time Clock Error
Probable Cause Recommended Action
Real-time clock fails BIOS test Replace the system board.
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System Battery is Dead
Probable Cause Recommended Action
RTC battery is dead 1. Replace the RTC battery.
2. Run Setup.
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System BIOS Shadowed
Probable Cause Recommended Action
System BIOS copied to Shadow RAM Replace the system board.
Status message only; no
action required.
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System Cache Error
Probable Cause Recommended Action
RAM cache failed the BIOS test Run Setup.
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System CMOS Checksum Bad
Probable Cause Recommended Action
CMOS is corrupted or modified incorrectly Run Setup.
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System RAM Failed at Offset, nnn
Probable Cause Recommended Action
System RAM failed Replace memory modules.
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System Timer Error
Probable Cause Recommended Action
DMA, timers, etc. Replace the system board.
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UMB Upper Limit Segment Address nnn
Probable Cause Recommended Action
Displays the address nnn of the upper limit
of Upper Memory Blocks, indicating released segments of the
BIOS
Run Setup.
Status message only; no
action required.
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Video BIOS Shadowed
Probable Cause Recommended Action
Video BIOS successfully copied to shadow RAM Run Setup.
Status message only; no
action required.
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