Table 5-3 Diagnostic lights and audible codesActivity Possible cause Recommended actionGreen Power LED On. Nobeeps.Workstation on.NoneGreen Power LED blinksevery two seconds.** Nobeeps.Workstation in Suspend toRAM mode (select modelsonly) or normal Suspendmode.Green Power LED is off.**No beeps.Workstation in Suspend toDisk or “Hibernate” mode.Green Power LED blinksthree times, once persecond.** No beepsWorkstation in Suspend toRAM mode (select modelsonly) or normal Suspendmode.Green Power LED blinksfour times, once persecond.** No beeps.Workstation in Suspend toDisk or “Hibernate” mode.NOTE: ** — The BIOS option you select controls the green LED function during these suspend modes.For the following LED activity and beeps, the beeps are heard through the chassis speaker. Blinks and beeps repeat for 5 cycles, afterwhich, only the blinks continue to repeat.Red Power LED blinks twotimes, once every second,followed by a two-secondpause. Two beeps.Processor thermalprotection activated by eitherof the following methods:● A fan might be blockedor not turning.● The heatsink and fanassembly is notproperly attached to theprocessor.CAUTION: Internal components might be powered even when thesystem is off. To prevent damage, disconnect the workstation power cordbefore you remove a component.1. Ensure that the workstation air vents are not blocked and the coolingfan is running.2. Open the access panel, press power button, and verify that theprocessor fan is spinning. If the processor fan is not spinning, makesure the fan cable is plugged into the system board header. Ensurethe fan is fully and properly seated or installed.3. If fan is plugged in and seated properly, but is not spinning, theproblem might be in the processor fan. Contact HP for assistance.4. Verify that the fan assembly is properly attached. If problems persist,there might be a problem with the processor heatsink. Contact HPfor assistance.Red Power LED blinks threetimes, once every second,followed by a two-secondpause. Three beeps.Processor not installed (notan indicator of badprocessor).1. Verify that the processor is present.2. Reseat the processor.Red Power LED blinks fourtimes, once every second,followed by a two-secondpause. Four beeps.Power failure (power supplyis overloaded)CAUTION: Internal components might be powered even when thesystem is off. To prevent damage, disconnect the workstation power cordbefore you remove a component.1. Open the access panel and ensure the following connections aresecure on the system board:◦ 24–pin main power (all systems)◦ 4–pin CPU (xw4000 series)◦ 8–pin CPU (xw6000/xw8000/xw9000 series)◦ 4–pin memory (xw8000/xw9000 series)ENWW Basic troubleshooting 43