HP Xw8400 HP xw8400 Workstation - Service and Technical Reference Guide - Page 122
Solving diskette problems, Table 5-5
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Table 5-4 Power supply problems (continued) Problem Cause Solution Workstation powered off automatically and the Power LED flashes red two times, once every second, followed by a two-second pause. Processor thermal protection activated. A fan might be blocked or not turning. OR The CPU heatsink fan assembly is not properly attached to the processor. 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. Be sure that the workstation air vents are not blocked and the cooling fan is running. 2. Open the access panel, press the power button, and determine if the processor fan spins. If the processor fan is not spinning, be sure the fan's cable is plugged into the system board header. Be sure the fan is properly seated or installed. 3. Replace the processor fan. 4. Reseat the CPU heatsink, and verify that the fan assembly is properly attached. Power LED flashes red, once every two seconds. Power failure (power supply is overloaded). 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. Determine whether a device is causing the problem by removing all attached devices). 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 causing the failure. Continue adding devices one at a time to ensure all devices are functioning properly. 2. 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. Solving diskette problems Table 5-5 Diskette problems Problem Cause Solution Diskette drive light stays on. Diskette is damaged. Right-click Start, click Explore, and select a drive. Select File>Properties>Tools. Under Error-checking, click Check Now. Diskette is incorrectly inserted. Remove diskette and reinsert. Files on diskette are damaged. Check the program diskettes. Drive cable is not properly connected. Reconnect power cable. Be sure that all four pins are connected. 112 Chapter 5 System diagnostics and troubleshooting ENWW