Compaq dx7400 Service Reference Guide - HP Compaq dx7400 Business PC - Page 150
Table C-2, Activity, Beeps, Possible Cause, Recommended Action
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Table C-2 Diagnostic Front Panel LEDs and Audible Codes (continued) Activity Beeps Possible Cause Recommended Action iteration but LEDs continue until problem is solved. 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 1. checksum. Reflash the system ROM with the latest BIOS image. See the "Boot Block Emergency Recovery Mode" section of the Desktop Management Guide for more information. 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. 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. Unplug the AC power cord from the computer, wait 30 seconds, then plug the power cord back in to the computer. 3. Replace the system board. 4. Replace the processor. Red Power LED flashes ten 10 times, once every second, followed by a two second pause. Beeps stop after fifth iteration but LEDs continue until problem is solved. Bad option card. 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. Red Power LED flashes eleven 11 times, once every second, followed by a two second pause. Beeps stop after fifth iteration but LEDs continue until problem is solved. The current processor 1. does not support a feature previously enabled on this 2. system. Install a TXT capable processor. Disable TXT in the Computer Setup (F10) utility. 3. Reinstall the original processor. System does not power on and None LEDs are not flashing. System unable to power on. Press and hold the power button for less than 4 seconds. If the hard drive LED turns green, the power button is working correctly. Try the following: 1. Check that the voltage selector (some models), located on the rear of the power supply, is set to the appropriate voltage. Proper voltage setting depends on your region. 2. Replace the system board. OR Press and hold the power button for less than 4 seconds. If the hard drive LED does not turn on green then: 1. Check that the unit is plugged into a working AC outlet. 2. Open hood and check that the power button harness is properly connected to the system board. 140 Appendix C POST Error Messages