Why does my HP Pro 3330 Desktop computer power off automatically and the Power LED flashes Red four times?
- Aandrew03Aug 16, 2025
This usually indicates a power failure or that the power supply is overloaded. Here's what you can do: 1. Check the voltage selector on the rear of the power supply (on some models) to ensure it's set to the correct voltage for your region. 2. Open the computer case and make sure the 4- or 6-wire power supply cable is properly connected to the system board. 3. Try removing all attached devices (like hard drives, diskette drives, optical drives, and expansion cards) and power on the system. If it enters POST, power off, replace one device at a time, and repeat until the failure occurs. Replace the faulty device. 4. If the issue persists, consider replacing the power supply or the system board.