HP Z800 HP Z800 Workstation Maintenance and Service Guide - Page 206
Minor problems continued, Table 6-1
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Table 6-1 Minor problems (continued) Problem Cause Possible Solution Workstation powered off automatically and the Power LED flashes red 2 times (once every second), followed by a 2second pause, and then two simultaneous beeps sounded. Processor thermal protection is activated. A fan might be blocked or not turning. OR The processor heatsink is not properly attached to the processor. 1. Verify that the workstation air vents are not blocked. 2. Open the access panel and press the workstation power button. 3. Verify that the system fan is running. 4. Verify that the processor heatsink fan spins. If the fan is not spinning, verify that the heatsink fan cable is plugged into the system board connector and that the heatsink is properly seated. 5. Replace the processor heatsink. System does not power on, and the LEDs on the front of the workstation are not flashing. System cannot power on. Press and hold the power button for less than four seconds. If the hard drive LED turns green, then perform the following steps. OR 1. To find a faulty device, remove all devices one at a time: a. Disconnect AC power to the workstation. b. Remove a device. c. Reconnect AC power and power on the workstation. 2. Repeat this process until the faulty device is identified. Remove the graphics card last. Replace the faulty device. 3. If no faulty device is found, replace the system board. 1. Press and hold the power button for less than four seconds. If the hard drive LED does not illuminate, then perform the following tasks: a. Verify that the workstation is plugged into a working AC outlet. b. Verify that the power button harness is connected to the inline front panel I/O device assembly connector. 2. Verify that the power supply cables are connected to the system board. 3. Verify power supply functionality: a. Disconnect the AC power. b. Remove the power supply. c. Reconnect the AC power. ● If the power supply fan spins and the BIST LED illuminates (see Testing power supply on page 195), the power supply is good. Replace the system board. ● If the power supply fan does not spin or the LED does not illuminate (see Testing power supply on page 195), replace the power supply. 194 Chapter 6 Diagnostics and troubleshooting ENWW