HP Dc5750 HP Compaq dc5750 Business PC Service Reference Guide, 1st Edition - Page 165
Red Power LED, Continued
UPC - 883585056446
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POST Error Messages POST Diagnostic Front Panel LEDs and Audible Codes (Continued) Activity Red Power LED flashes nine times, once every second, followed by a two second pause. Beeps stop after fifth iteration but LEDs continue until problem is solved. Red Power LED flashes ten times, once every second, followed by a two second pause. Beeps stop after fifth iteration but LEDs continue until problem is solved. Beeps 9 10 Possible Cause System powers on but is unable to boot. Bad option card. Recommended Action 1. Check that the voltage selector, located on the rear of the power supply (some models), is set to the appropriate voltage. Proper voltage setting depends on your region. 2. Replace the processor. 3. Replace the system board. 1. Check each option card by removing the card (one at a time if multiple cards), then power on the system to see if fault goes away. 2. Once a bad card is identified, remove and replace the bad option card. 3. Replace the system board. Service Reference Guide, dc5750 437963-001 C-11