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HP Pavilion a1150y fans run when powered on but windows doesn't load, monitor, mouse and keyboard do not work. (Running Windows XP)

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  • HP Master
  • 5,660 Answers

Believe it or not, it's due to a weak power supply. More specifically, weak voltage rail/s caused by failing Electrolytic Capacitors.

A bad computer power supply is about 70% of computer failure.

ALL the light use less than 1 Watt. EACH fan uses 2 to 3 Watts.

A processor uses 55 to 125 Watts. Depends on the make and model.

Since the power supply is weak, it doesn't have enough power to turn the processor on.
No processor, nothing to find the Boot record on the harddrive. Nothing to get the Operating System going. (Example: Windows XP)

No computer running, there is no signal to the monitor.
Just enough power to light lights, and spin fans.

Posted on Apr 13, 2009

  • Marcos Sep 22, 2011

    My HP Pavilion m7100e would not boot, but all my fans ran, cpu-high speed, case and power supply fan, blue light came on, DVD drive light flashed, but could not hear my HDD's click and no keyboard or mouse. Nothing on monitor. Tech's at computer stores told me it was not the power supply because my fans ran, THEY WERE WRONG! It was the power supply.

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