HP dx6120 HP Business Desktop dx6100 Series Personal Computers Service Referen - Page 233

Diagnostic Front Panel LEDs and Audible Codes (Continued) Activity Beeps Possible Cause Recommended Action Red Power LED flashes three times, once every second, followed by a two second pause and the computer beeps three times. Beeps stop after fifth iteration but LEDs continue until problem is resolved. 3 Processor not installed (not an indicator of bad processor). 1. Check to see that the processor is present. 2. Reseat the processor. Red Power LED flashes four times, once every second, followed by a two second pause and the computer beeps four times. Beeps stop after fifth iteration but LEDs continue until problem is resolved. 4 Power failure (power supply is overloaded). 1. Open the hood and ensure the 4- or 6-wire power supply cable is seated into the connector on the system board. 2. Check if a device is causing the problem by removing ALL attached devices (such as hard, diskette, or optical drives, and expansion cards). Power on the system. If the system enters the POST, then power off and replace one device at a time and repeat this procedure until failure occurs. Replace the device that is causing the failure. Continue adding devices one at a time to ensure all devices are functioning properly. 3. Replace the power supply. 4. Replace the system board. Red Power LED flashes five times, once every second, followed by a two second pause and the computer beeps five times. Beeps stop after fifth iteration but LEDs continue until problem is resolved. 5 Pre-video memory 1. Reseat DIMMs. Power on the system. error. 2. Replace DIMMs one at a time to isolate the faulty module. 3. Replace third-party memory with HP memory. 4. Replace the system board. Service Reference Guide, dx6100 361293-003 D-31