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HP ProSignia 320 Desktop PC 6433C Compaq Deskpro Family of Personal Computers, - Page 74

UMB Upper Limit Segment, System RAM Failed

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POST Error Messages Continued Error message Probable Cause System BIOS Shadowed System BIOS copied to Shadow RAM. System Cache Error RAM cache failed the BIOS test. System CMOS Checksum Bad CMOS is corrupted or modified incorrectly. System RAM Failed at Offset, nnn System Timer Error System RAM failed. DMA, timers, etc. UMB Upper Limit Segment Address nnn Displays the address nnn of the upper limit of Upper Memory Blocks, indicating released segments of the BIOS. Video BIOS Shadowed Video BIOS successfully copied to shadow RAM. Recommended Action Status message. No action required. Run Setup. Run Setup. Replace memory modules. Replace the system board. Status message. No action required. Status message. No action required. Quick Troubleshooting Guide C-3

Section	Page
Quick Troubleshooting Guide	1
Notice	2
Table of Contents	4
chapter 1 - General Service Information	6
Troubleshooting Procedures	6
Tools Required - Desktop Computers and Workstations	6
Tools Required - Notebooks	6
Protecting Yourself and the Computer	6
Clearing CMOS	7
Customer Responsibilities	7
POST Power-On Sequence	8
Compaq Drive Protection System	8
Accessing DPS Through Compaq Diagnostics for Windows	9
Compaq Configuration Record Utility	9
chapter 2 - Troubleshooting Flowcharts for Desktop Computers	10
1. Initial Troubleshooting	11
2. No Power, Part 1	12
3. No Power, Part 2	13
4. No Power, Part 3	14
5. No Video, Part 1	15
6. No Video, Part 2	16
7. No Video, Part 3	17
8. Error Messages, Part 1	18
9. Error Messages, Part 2	19
10. Error Messages, Part 3	20
11. No O/S Loading	21
12. No O/S Loading from Hard Drive, Part 1	22
13. No O/S Loading from Hard Drive, Part 2	23
14. No O/S Loading from Hard Drive, Part 3	24
15. No O/S Loading from Diskette Drive	25
16. No O/S Loading from CD-ROM Drive	26
17. No O/S Loading from Network	27
18. Non-Functioning Device	28
chapter 3 - Troubleshooting Flowcharts for Portable Computers	29
1. Initial Troubleshooting	30
2. No Power, Part 1	31
3. No Power, Part 2	32
4. No Power, Part 3	33
5. No Power, Part 4	34
6. No Video, Part 1	35
7. No Video, Part 2	36
8. Non-Functioning Docking Station	37
9. No O/S Loading	38
10. No O/S Loading from Hard Drive, Part 1	39
11. No O/S Loading from Hard Drive, Part 2	40
12. No O/S Loading from Hard Drive, Part 3	41
13. No O/S Loading from Diskette Drive	42
14. No O/S Loading from CD-ROM or DVD-ROM Drive	43
15. No Audio, Part 1	44
16. No Audio, Part 2	45
17. Non-Functioning Device	46
18. Non-Functioning Pointing Device or Keyboard	47
19. No Network or Modem Connection	48
appendix A - Further Troubleshooting	49
appendix B - POST Error Messages - Numbered	62