HP RP7 Hardware Reference Guide HP RP7 Retail System Model 7800 - Page 72
Appendix A, Troubleshooting, Diagnostic Front Panel LEDs and Audible Codes continued
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Table A-1 Diagnostic Front Panel LEDs and Audible Codes (continued) Activity Beeps Possible Cause Recommended Action Red Power LED flashes four 4 times, once every second, followed by a two second pause. Beeps stop after fifth iteration but LEDs continue until problem is solved. Power failure (power supply is overloaded). 1. Ensure the DC power cable is plugged into the I/O panel. 2. Check if a device is causing the problem by removing ALL attached devices (such as a hard drive). Power on the system. If the system enters the POST, then power off and replace the device to see if the problem is resolved. 3. Replace the power supply. 4. Replace the system board. Red Power LED flashes five 5 times, once every second, followed by a two second pause. Beeps stop after fifth iteration but LEDs continue until problem is solved. Pre-video memory error. CAUTION: To avoid damage to the SODIMMs or the system board, you must unplug the computer power cord before attempting to reseat, install, or remove a SODIMM module. 1. Reseat SODIMMs. 2. Replace SODIMMs one at a time to isolate the faulty module. 3. Replace third-party memory with HP memory. 4. Replace the system board. Red Power LED flashes six 6 times, once every second, followed by a two second pause. Beeps stop after fifth iteration but LEDs continue until problem is solved. Pre-video graphics error. 1. Unplug the power cord. Press the CMOS reset button. Install the FDO jumper to disable ME (or remove the FDO jumper to disable ME if it was installed). 2. Replace the system board. Red Power LED flashes 7 seven times, once every second, followed by a two second pause. Beeps stop after fifth iteration but LEDs continue until problem is solved. System board failure (ROM detected failure prior to video). Replace the system board. Red Power LED flashes eight 8 times, once every second, followed by a two second pause. Beeps stop after fifth iteration but LEDs continue until problem is solved. Invalid ROM based on bad checksum. 1. Reflash the system ROM with the latest BIOS image. 2. Replace the system board. Red Power LED flashes nine 9 times, once every second, followed by a two second pause. Beeps stop after fifth iteration but LEDs continue until problem is solved. System powers on but is unable to boot. 1. Replace the processor. 2. Replace the system board. 66 Appendix A Troubleshooting