HP Z600 HP Z600 Workstation Maintenance and Service Guide - Page 194
Diagnostic lights and audible codes continued
UPC - 884962074053
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Table 6-8 Diagnostic lights and audible codes (continued) Activity Possible cause Recommended action Red Power LED blinks four times, once every second, followed by a two-second pause. Four beeps. Power failure (power supply CAUTION: Internal components might be powered even when the is overloaded) workstation is off. To prevent damage, disconnect the workstation power cord before you remove a component. 1. Open the access panel and ensure that all power connections (18pin Main, 8-pin CPU, 6-pin Memory) are secure on the system board. 2. Check if a device is causing the problem by removing all attached devices (such as hard, diskette, or optical disk drives, and expansion cards.) Power on the workstation. If the system enters the POST, power off and replace one device at a time; repeat this procedure until failure occurs. Replace the device that is causing the failure. Continue adding devices one at a time to ensure all devices are functioning properly. 3. Check the power supply functionality. a. Disconnect the AC power. b. Remove power supply from system chassis. (See Removing the power supply on page 78 for details.) c. Plug in the AC power. If the power supply fan spins and the BIST** LED lights, the power supply is functional. The problem might be on the system board. Contact HP for assistance. If the power supply fan does not spin or the BIST** LED does not light, the problem might be in the power supply. Contact HP for assistance. Red Power LED blinks five times, once every second, followed by a two-second pause. Five beeps. Pre-video memory error CAUTION: Internal components might be powered even when the workstation is off. To prevent damage, disconnect the workstation power cord before you remove a component. 1. Reseat DIMMs. 2. Replace DIMMs one at a time to isolate faulty module. 3. Replace third-party memory with HP memory. 4. The problem might be on the system board. Contact HP for assistance. Red Power LED blinks six times, once every second, followed by a two-second pause. Six beeps. Pre-video graphics error. CAUTION: Internal components might be powered even when the workstation is off. To prevent damage, disconnect the workstation power cord before you remove a component. 1. Reseat the graphics card. 2. The problem might be on the graphics card. Contact HP for assistance. Red Power LED blinks seven times, once every second, followed by a twosecond pause. Seven beeps. System board failure (ROM 1. Clear CMOS. detected failure prior to video). NOTE: Refer to the Maintenance and Service Guide for the workstation model for detailed information on clearing CMOS. 2. The problem might be on the system board. Contact HP for assistance. 182 Chapter 6 Diagnostics and troubleshooting ENWW