HP Dc7900 Service Reference Guide: HP Compaq dc7900 Business PC - Page 241
Numeric Codes and Text Messages continued, Table C-1 - motherboard
UPC - 884962028483
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Table C-1 Numeric Codes and Text Messages (continued) Control panel message Description Recommended action 304-Keyboard or System Unit Error Keyboard failure. 1. Reconnect the keyboard with computer turned off. 2. Ensure that none of the keys are depressed. 3. Replace the keyboard. 4. Replace the system board. 501-Display Adapter Failure Graphics display controller. 1. Reseat the graphics card (if applicable). 2. Clear CMOS. 3. Verify monitor is attached and turned on. 4. Replace the graphics card (if possible). 510-Flash Screen Image Corrupted Flash Screen image has errors. Reflash the system ROM with the latest BIOS image. 511-CPU, CPUA, or CPUB Fan not Detected CPU fan is not connected or may have malfunctioned. 1. Reseat CPU fan. 2. Reseat fan cable. 3. Replace CPU fan. 512-Chassis, Rear Chassis, or Front Chassis Chassis, rear chassis, or front chassis fan is 1. Reseat chassis, rear chassis, or front Fan not Detected not connected or may have malfunctioned. chassis fan. 2. Reseat fan cable. 3. Replace chassis, rear chassis, or front chassis fan. 514-CPU or Chassis Fan not Detected CPU or chassis fan is not connected or may 1. Reseat CPU or chassis fan. have malfunctioned. 2. Reseat fan cable. 3. Replace CPU or chassis fan. 601-Diskette Controller Error Diskette controller circuitry or floppy drive circuitry incorrect. 1. Check and/or replace cables. 2. Clear CMOS. 3. Replace diskette drive. 4. Replace the system board. 605-Diskette Drive Type Error Mismatch in drive type. 1. Disconnect any other diskette controller devices (tape drives). 2. Clear CMOS. 660-Display cache is detected unreliable Integrated graphics controller display cache Replace system board if minimal graphics is not working properly and will be disabled. degrading is an issue. 912-Computer Cover Has Been Removed Since Last System Startup Computer cover was removed since last system startup. No action required. 917-Front Audio Not Connected Front audio harness has been detached or Reconnect or replace front audio harness. unseated from motherboard. 918-Front USB Not Connected Front USB harness has been detached or unseated from motherboard. Reconnect or replace front USB harness. POST Numeric Codes and Text Messages 229