HP Dc7100 Troubleshooting Guide - Page 77
Activity, Beeps, Possible Cause, Recommended Action
UPC - 829160356877
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POST Error Messages Diagnostic Front Panel LEDs and Audible Codes (Continued) Activity Beeps Possible Cause Recommended Action Red Power LED flashes four times, once every second, followed by a two second pause. 4 Power failure (power supply is overloaded). 1. Open the hood and ensure the 4-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. 5 Pre-video memory 1. Reseat DIMMs. Power on the error. system. 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. Red Power LED flashes six times, once every second, followed by a two second pause. 6 Pre-video graphics For systems with a graphics card: error. 1. Reseat the graphics card. Power on the system. 2. Replace the graphics card. 3. Replace the system board. For systems with integrated graphics, replace the system board. Troubleshooting Guide www.hp.com A-15