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Power switch went bad. need to know which pins attach to which wires

My HP pavilion a545c had a on/off switch which broke. The spring switch was bad. I had a computer hardware guy replace it but I think he may have put the female pin terminals in the wrong places. Now it doesnt work. How do I Know which wires go to which pins?

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Looking at the front of PC remove the left side panel. Now looking in at the board. There are two rows of pins in the lowest right hand corner of the board. Your PWRSW is your power switch. Its a two pin connector. The ground wire will be black or white. The ground faces to the right & connects at pin 4 counting from right to left. Power switch takes up pin 4&5.
All done. If tech switched the wires by mistake than flip the connector 180*.

Posted on Jan 01, 2008


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My HP pavilion a620n won't power back on when I push button on the front, there is a little green light on the back that went off when I unplugged everthing attached to the back. Could this be a b

it could be a faulty switch or the bad lead connections

test all power and data leads that attach to your hard drive IDE SATA

MOTHERBOARD TO THE HARD DRIVE make sure they have secure dust free connections and are not faulty if its a flat ribbon 40pin ide

this will be the first to fail

make sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have secure dust free connections

a computer needs power and data to travel through every working device and continue its cycle and have a finishing point so any faulty leads will end up with a computer error

make sure the CPU has a secure dust free seating with thermal paste

make sure your ram modules are securely seated with no dust in the sockets also the Cmos battery has charge with no dust in the socket
on some motherboards cmos batteries are soldered in

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1 Answer

Hp palilivon a 1100y lost all power will not come back on i checked all cords power source everything seems to be ok. but no power still?

I'm going to base this solution on two scenarios from the info you have posted.

1) The power to your home/business went out. Now it's back on.

2) The power has been on all along, and the computer quit.

Based on 1) above;

The Power On switch could be bad, or the Power Supply.

A voltage spike could have occurred, and taken out the ATX power on switch.
(A generic ATX Power On switch is around $5. Example, )

A voltage spike could have taken out a power supply that is of low quality, and/or on it's last leg.

The power supply used in an HP Pavilion a1100y desktop computer is of low quality.
Low quality components are used inside.
(Bestec, and Delta are two of the low quality power supply's used by HP in this time frame)

Plus add to the fact that the computer has some age on it, (5 years old?), and could be dirty inside.
Dirt,dust, etc. 'kills' computers and power supply's.

There is a simple test to perform to see whether the problem is the Power Supply, or the Power On switch.
(The Power On switch is located within the plastic Power On button assembly)
If you wish to know how to perform this test please post in a Comment.

Based on 2) above;
The Power Supply is bad.
The test would be either to use a multimeter, and check the three main voltages coming out of the Power Supply,
Substitute the power supply with a KNOWN to be good compatible unit.
(250 to 300 Watt)

(Sometimes access to another known to be good, compatible power supply may be obtained from a computer that is no longer in use. The user has upgraded to a better computer.
Compatible being that the Power Supply has the required Wattage, and required power cables)

[The three main voltages produced by an SMPS (Switched-Mode Power Supply) used by the Pavilion a1100y desktop computer are;

A) 3.3 Volts DC (Orange wire)
B) 5 Volts DC (Red wire)
C) 12 Volts DC (Yellow wire)
In comparison two D cell flashlight batteries produce 3 Volts DC ]

This is HP Support>Pavilion a1100y desktop computer> Motherboard Specifications,

Looking at the motherboard illustration, and photo at the bottom of the page, we can see what power cables are needed for the motherboard;

A) 24-pin ATX main power cable
(Connector on motherboard illustration marked as ATXPWER1. In the photo it is whitish, and has two vertical columns of 12 square socket holes. It is to the Right of the Ram Memory slots)

B) 4-pin ATX main power cable.
(Connector on motherboard illustration is marked ATX12V. It is to the left of the Intel Northbridge chipset - Intel 915GV GMCH.
In the photo it is the whitish square connector with four square socket holes. It is to the Left of the
aluminum finned Heatsink, sitting on top of the Intel Northbridge chipset)

Other power cables needed are;
1) A SATA power cable for the SATA harddrive
2) One or two 4-pin Peripheral (Standard) power cables for the optical drive/s. (CD/DVD drives)

The Processor fan cable attaches to the motherboard. (CPU_FAN)
The computer case fan attaches to the motherboard. (SYS_FAN)

The ATX form factor is used primarily for describing a motherboard.
Form Factor denotes the size, and shape, and power cables for a Power Supply.

The ATX form factor for a Power Supply;
Size: Approximately 6 inches Wide, 5-1/2 inches Long, and 3-1/2 inches Tall.

A $40 ATX power supply with 300 Watts will do just fine. No need to buy an expensive Power Supply based on advertising as a direct substitute.

One example of an inexpensive reliable ATX power supply for a Pavilion a1100y desktop computer,

Has all the power cables you'll need. Actual maximum wattage rating is 350 Watts.

For additional questions or to clarify anything I have stated, please post in a Comment.


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1 Answer

My hp pavilion a305w would start up but no lights changed power pack but now i dont know what wires go where since i didnt write down where they went can u help me?

Power supply plug goes in the plug on the motherboard, that is the big plug. There wil be one 4 pin plug that goes to the hard drive and one to the DVD drive. There will be some extra plugs for future hardware installs

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