Question about IBM (01K9845) 145-Watt Power Supply

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HP Pavilion a705w power supply

Power supply fan doesn't come on so i assume the power supply is bad. It would boot to Windows start up but never open windows. Think more could be damaged or would replacement power supply be good investment?

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Re: HP Pavilion a705w power supply

Mtn texas , If you PSU cooling fan is not working it could be just the fan. However based on the other facts you have a failing power supply.. Its not dead completely yet but it will be. If you want to contact me direct my email is I am a certified Tech and run my own computer repiar business.

Posted on Dec 12, 2007

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Re: HP Pavilion a705w power supply

If you have a lot of time to fix your PSU and have a knowledge in soldering, you can unscrew it check for the burned electronics component inside and replace it exact value of d component. then check fan wire connection if it attached or still working.

Posted on Sep 15, 2008

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It sounds like the power has failed or is failing. This link will take you to the HP site:
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You can purchase a power supply tester, they are not that expensive. Here is a link for some and if you want you can shop around. Make sure to get a 20/24 pin tester.

Also if you do have a bad power supply here is a replacement.

Hope this helps you out.

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1 Answer

Pc no start.........

You might have a bad power supply. If you have a voltmeter, check the voltage of the standby power supply. This voltage is present even if the system is off, plugged in. It powers a small portion of the logic circuit. It should measure within a couple of tenths of exactly +5 volts. If it is low, or high, this will prevent turn-on. The purple wire of the 24 pin connector is what carries this to the motherboard. The color coding layout is found at If by chance this voltage is OK, then check the full on voltages also. Repair of the defective supply is probably by replacement of one or more small electrolytic capacitors in the appropriate circuit, especially if you are technically savvy. Capacitors are available through several suppliers; Digi-Key supplyies Panasonic FC series which are suitable for switching power supplies. Or, you may just replace the whole unit.

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