Maintenance & Service Guide
Presario 7900 Series Personal Computers
Models: 7922, 7930, 7935, 7940, 7947, 7950, 7970,
7973, 7985
| MSG Index | Product Description | Troubleshooting | Illustrated Parts |
| Home | Removal & Replacement | Jumpers & Switches | Specifications |
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.
| 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. |
|
| Probable Cause | Recommended Action | |
| Extended memory not working or not configured properly | 1. Replace
the memory modules. 2. Replace the system board. |
|
| 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. |
|
| 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. |
|
| Probable Cause | Recommended Action | |
| Hard drive is not working or configured properly | 1. Run
Setup. 2. Replace the system board. |
|
| Probable Cause | Recommended Action | |
| Type of diskette drive A: not correctly identified | 1. Run
Setup. 2. Replace the diskette drive. |
|
| Probable Cause | Recommended Action | |
| Problem with NVRAM (CMOS) access | Replace the system board. | |
| 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. |
|
| 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. |
|
| Probable Cause | Recommended Action | |
| Operating system cannot
be located on either drive A: or C: |
Run Setup. | |
| Probable Cause | Recommended Action | |
| Parity error found in the system bus | 1. Run
Setup. 2. Replace the memory modules. 3. Replace the system board. |
|
| Probable Cause | Recommended Action | |
| Parity error found in the I/O bus | 1. Run
Setup. 2. Replace the ISA board (modem). |
|
| Probable Cause | Recommended Action | |
| Real-time clock fails BIOS test | Replace the system board. | |
| Probable Cause | Recommended Action | |
| RTC battery is dead | 1. Replace
the RTC battery. 2. Run Setup. |
|
| Probable Cause | Recommended Action | |
| System BIOS copied to Shadow RAM | Replace the
system board. Status message only; no action required. |
|
| Probable Cause | Recommended Action | |
| RAM cache failed the BIOS test | Run Setup. | |
| Probable Cause | Recommended Action | |
| CMOS is corrupted or modified incorrectly | Run Setup. | |
| Probable Cause | Recommended Action | |
| System RAM failed | Replace memory modules. | |
System Timer Error |
||
| Probable Cause | Recommended Action | |
| DMA, timers, etc. | Replace the system board. | |
| 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. |
|
| Probable Cause | Recommended Action | |
| Video BIOS successfully copied to shadow RAM | Run Setup. Status message only; no action required. |
|
