HP Xw9400 HP xw9400 Workstation - Service and Technical Reference Guide - Page 149
Problem, Cause, Possible Solution, CAUTION
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Table 6-3 Minor problems (continued) Problem Cause Workstation powered off Processor thermal automatically and the protection activated: Power LED flashes red two times, once every second, followed by a A fan might be blocked or not turning. two-second pause, and two simultaneous beeps OR are heard. The CPU heatsink is not properly attached to the processor. Workstation does not power on and the LEDs on the front of the workstation are not flashing. System unable to power on. Possible Solution CAUTION: Disconnect AC power from the workstation before reseating or replacing components because there is power to the system board even when the workstation is powered down. 1. Check system and CPU fan cables. 2. Be sure workstation air vents are not blocked and the cooling fan is running. 3. Open the access panel, press the power button, and determine if the processor fan spins. If not spinning, be sure the fan's cable is plugged into the system board header. Be sure the fan is fully/properly seated or installed. 4. Replace the processor fan. 5. Reseat CPU heatsink and verify that the fan assembly is properly attached. CAUTION: Disconnect AC power from the workstation before reseating or replacing components because there is power to the system board even when the workstation is powered down. Press and hold the power button for less than four seconds. If the hard drive LED turns green, then: 1. Remove the expansion cards. 2. Replace the system board. OR If the HDD LED does not illuminate, then: 1. Verify that the unit is plugged into a working AC outlet. 2. Open the access panel, and verify that the power button harness is properly connected to the inline front panel I/O device assembly connector. 3. Verify that the power supply cables are properly connected to the system board. 4. Verify power supply functionality: a. Disconnect AC power. b. Remove all internal power supply cables from the system board. c. Plug in AC power. ● If the power supply fan spins and the BIST* LED lights, then the power supply is good. Replace the system board. ● If the power supply fan does not spin or the BIST* LED does not light, replace the power supply. ENWW Troubleshooting scenarios and solutions 139