1.1. PSU: The power supply is without function or the PC doesn’t start

Possible causes:

  • The power switch cable from the PC case is not connected to the mainboard.
  • The 20/24 pin ATX connector is not properly attached and doesn’t have proper contacts.
  • The P4 connector is not plugged in (presuming the mainboard requires it).
  • The CPU is not properly attached to the socket.
  • Memory is not compatible with the mainboard. (PCs can start without memory chips; if the mainboard produces post codes (beeps) then the power supply is OK).
  • Check that all PC cards are correctly seated into their slots.
  • The power supply’s main switch is not switched on.
  • The main power cable is not connected to the power supply unit.
  • The multiple socket outlet may be defective, or need to be switched on, if a switch is available.
  • The mainboard may be defective.

1.2. PSU: The power supply restarts or shuts down

Possible causes:

  • Insufficient cooling of the PC case causes the powe supply to shut down. Additional fans can prevent this problem.
  • The power supply unit is being overloaded by a retrofitted high-end component (e.g. graphics card). A stronger power supply could help.
  • Lightning strike on the power network (overvoltage). The overvoltage protaction has been triggered. The Power supply should be able to restart again.
  • A large amount of dust cause high temperatures, which overheat the power supply. The PC should be cleaned from dust from time to time. Dust can even become statically charged and cause systems to crash.

1.3. PSU: The power supply fan is too noisy

Possible causes:

  • High temperatures in the PC case. There are too few fans mounted in the case.
  • The CPU or GPU fan is blowing warm air into the power supply causing it to heat up more than normal. Adjust the airflow in you case.
  • A cable got cought inside the power supplies fan producing a rattling noise. Use a cable tie to secure the surrounding cables.
  • You are running the PSU at the limit or overloading it. Check the power consumption of your components, you may need to use a stronger power supply.

1.4. PSU: My power supply fan does not work

Possible causes:

  • You have a semi-fanless power supply. Some models start the power supply’s fan only after certain load or temperature. Check your power supply’s user manual to be sure.
  • Your power supply’s fan is broken. You need to contact your dealer for RMA or replace the power supply if your warranty is over. Under no condition should you try to open the power supply and replace the fan by yourself. This can endanger your life. A power supply unit has high voltage charged insiede the capacitors even after it is unpluged.

2.1. CPU Cooler: Your liquid cooler makes bubbling sound

Possible causes:

  • The liquid cooler is freshy mounted and needs to run a few minutes to settle the air inside the circuit.
  • The tubes are facing the upper side preventing the water tank to filter the air bubbles. This will not happen to a liquid cooler mounted on the top panel.

2.2. CPU Cooler: Your CPU cooler fan turns off or LEDs are dimmed

Possible causes:

  • The CPU cooler is not connected to a PWM-capable connector on your mainboard. 3-pin or sometimes 4-pin connections without PWM control can only control the fan speed via voltage regulation. If the controller sets the voltage below the minimum voltage of the CPU fan, the fan stops. LEDs connected to such a connection dim when the voltage drops. To prevent this, make sure that your CPU cooler is connected to the 4-pin PWM connector of your mainboard, which is marked “CPU” or “CPU Fan 1”. Normally, this connection supports PWM control.


If you are looking into an ENERMAX power supply through the fan blades, you may see special white glue on various coils. This is normal. It is a necessary left over from the production process and does not impact performance in any way.