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Power LED flashes Red four times, once every second, followed by a two second pause, and the
computer beeps four times. (Beeps stop after fifth iteration but LEDs continue flashing.)
Cause Solution
Power failure (power supply is overloaded). 1. Check that the voltage selector, located on the rear of
the power supply (some models), is set to the appropriate
voltage. Proper voltage setting depends on your region.
2. Open the hood and ensure the 4- or 6-wire power supply
cable is seated into the connector on the system board.
3. Check if a device is causing the problem by removing
ALL attached devices (such as hard, diskette, or optical
drives, and expansion cards). 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 that is causing the failure.
Continue adding devices one at a time to ensure all
devices are functioning properly.
4. Replace the power supply.
5. Replace the system board.
The incorrect external power supply adapter is being used on
the USDT.
The USDT power supply adapter must be at 135W and use
the Smart ID technology before the system will power up.
Replace the power supply adapter with the HP-supplied USDT
power supply adapter.
Solving Power Problems 271