Filter
Top Products
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.
Table D-2 Solving Power Problems (continued)
208 Appendix D Troubleshooting Without Diagnostics