LED/Beep Codes

The following table shows board-level LED and beep codes and the suggested recovery actions. Board-level means that the codes are built into the BIOS and operate free of the operating system. These codes are an attempt to standardize system diagnostics by incorporating them into the BIOS.

Condition	Code	Service Actions
Processor thermal protection activated.	Power LED blinks red twice, once a second, followed by a two second pause.	Make sure the computer air vents are not blocked and that the cooling fan is running. Open the hood, press the power button, and see if the processor fan spins. If the fan is not spinning, make sure the fan cable is plugged into the cable header on the system board, and that the fan is properly installed and seated. If the fan is plugged in and seated properly, but is still not spinning, replace the processor fan. Reseat the processor heatsink and make sure the fan assembly is attached to the heatsink properly.
Processor is not installed.	Power LED blinks red three times, once a second, followed by a two second pause.	NOTE: This condition indicates a missing or improperly installed processor, not a defective one.
Power failure (power supply is overloaded)	Power LED blinks red four times, once a second, followed by a two second pause.	Check the voltage selector, located on the rear of the power supply, is set to the correct voltage (the correct setting depends on the region). Open the hood and make sure the 4-wire power supply cable is fully connected to the power connector on the system board. Check if a device is causing the problem by removing all attached devices (such as disk drives and expansion cards), then power on the system. If the system enters POST, power off and replace one device at a time, repeating the procedure until the system power failure reoccurs. Replace the device that caused the failure, then replace each of the other devices and confirm that they are functioning properly. If you cannot isolate the failure to a specific device in the previous step, replace the power supply. ** Replace the system board.*
Pre-video memory error.	Power LED blinks red five times, once a second, followed by a two second pause, and five simultaneous beeps are sounded	Reseat the DIMMs in the memory slots on the system board, then power on the system. Replace the DIMMs one at a time to isolate the faulty module. Replace 3rd-party memory with HP memory. Replace the system board.*
Pre-video graphics error.	Power LED blinks red six times, once every second, followed by a two second pause, and six simultaneous beeps are sounded.	For systems with a graphic card:
PCA (system board) failure. ROM detected failure prior to video.	Power LED blinks red seven times, once a second, followed by a two second pause, and seven simultaneous beeps are sounded.	Replace the system board.
Invalid ROM based on bad checksum	Power LED blinks red eight times, once a second, followed by a two second pause, and eight simultaneous beeps are sounded.	Reflash the ROM using a ROMPaq diskette. Replace the system board.*
System does not power on.	No beeps or blinks since the system is not functioning.	Press and hold the power button for less than four seconds. Perform the following steps depending on whether the hard drive LED turns green.

* Replacing the system board is an absolute last resort if unable to isolate a failure to any other system component.

** Do not replace the power supply until all other suggested remedies have been tried.