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Pavilion a1150y no power but led on the back comes on

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Oh, I have experienced this one a few times...Some possibilities:
1. Make sure you have connected every single wire (on your motherboard) where you had to (refer to a manual if necessary)
2. Make sure the cpu has been properly attached and cpu is working...
3. Avoid any unecessary metallic objects on your motherboard or metallic parts of it (so as to avoid shortcircuits...)
(*4. Check if / I hope the necessary parts of your motherboard have not been fried...)

Turn off your PC (I would suggest that you unplug power completely, leave it for 10 seconds, replug and see if it works!)

Posted on Feb 09, 2014

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Posted on Jan 02, 2017

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joecoolvette
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SOURCE: HP Pavilion a1150y fans run when powered on but

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

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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.
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Sounds like it may be a power supply problem.

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