Question about HP Pavilion a1620n (882780664494) PC Desktop

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My 1620n HP pavilion will not start. The push button will not light or start the computer. I tried different outlets and power cords just in case, but it will not power up. I presume it is the power supply module gone wrong but want to know before I take it in for costly repair

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  • larry_moo748 Oct 13, 2010

    I did the jumper wire test as recommended by joecoolvette and it worked and the test told me that it isthe power switch not the power supply module (I got lights and a fan by by-passing the switch). Thanks for this advice

    I have completely removed the switch from the computer (unhooked the harness from the mother board and from thefront panel) and have the wiring assembly and switch outside of the computer. There appears nothing obviuos wrong with it but of course could be internal within a plastic pplug or wire

    Can this wiring harness and switch be replaced and if so where can I purchase one either on line or at a local store?




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Larry_moo748 I'll tell you how to see if it's the Power Supply, or the Power On switch that is the problem.
(The Power On switch is located inside the plastic Power On button)

I would also like you to reconsider taking it to a computer repair shop, IF the problem is a bad Power Supply, and replacing the Power Supply yourself.
It isn't that hard, and it will save you money.

The test to diagnose whether the problem is the Power Supply, or Power On switch, involves bypassing the Power On switch.

A jumper wire is made from a paper clip straightened out, then bent into a U-shape. The middle of the U-shape is wrapped with a few turns of plastic electrical tape.
This is where you hold the jumper wire.

The voltage involved here Larry is 5 Volts DC.
Two D cell flashlight batteries produce 3 Volts DC.
However there may be a small spark.
Just want you to know what is involved.

Also,...your Power Supply is a voltage converter. It converts 120 Volts AC, (USA), or 220 Volts AC (Europe), to three main DC voltages.
1) 3.3 Volts
2) 5 Volts
3) 12 Volts

I would like you to look at your Pavilion a1620n motherboard on HP Support,

Looking at the motherboard photo at the top, observe the Ram Memory slots.
The long Blue, and Black slots to the right, with the White lock tabs on each end.

To the right of ram memory slot 4, (Black slot all the way to the right), is the 24-pin ATX main power cable connector, on the motherboard.
It is a White vertical connector (In this photo orientation), and has 24 socket holes.
Two columns of 12.

This is where the 24-pin ATX main power cable from the Power Supply plugs in.
Let's look at a closer view of a typical 24-pin ATX main power cable,

Observe the photo to the far Right. This shows a 24-pin ATX main power cable plugged into the motherboard.
Observe the Green wire, and look at the Black wires.
The Green wire is the Soft Power On wire. (Also abbreviated as PS_ON)
This is a 5 Volt DC wire.

Observe the Black wires.
ALL Black wires are Ground wires.

The jumper wire goes down into the socket hole with the Green wire, RIGHT NEXT to the Green wire.
At the end of the Green wire is a metal terminal. The jumper wire must go down into the socket hole far enough to Touch the metal terminal. (Approximately 1/2 inch)

The other end of the jumper wire goes down into a socket hole with ANY Black wire.
The jumper wire is a U-shape. Both ends of the jumper wire go down into the above named socket holes, at the same time.

The connection made is no more than 2 seconds.
Power Supply comes on? You have a bad Power On switch.
Power Supply does Not come on? You have a bad Power Supply.
(Should have added before, that the Power Supply is plugged into power for this test)

Disconnect all cables to the computer tower, except for the power cord. Open the computer case. Lay the computer on it's side, open side up, on a table. You can lay the computer on a towel to keep from scratching the table, and the computer case.
(Doesn't hurt the computer to run laying on it's side. You can run a computer upside down if you wish. Kinda' hard to put a disk in the optical drive, though! lol)

After you have achieved this test, and if you have found the Power Supply to be bad, post in a Comment if you wish step by step instructions (And a video, or two), of how to replace the Power Supply.
I will also recommend a few Power Supply choices if you wish.

[ It's an ATX power supply.
300 Watt
Generic unit probably made by Bestec, HiPro, or Delta ]

Posted on Oct 10, 2010

  • 3 more comments 
  • joecoolvette
    joecoolvette Oct 10, 2010

    How to open the computer case:

  • joecoolvette
    joecoolvette Oct 10, 2010

    I see Add a comment needs some bugs worked out.

  • joecoolvette
    joecoolvette Oct 10, 2010

  • joecoolvette
    joecoolvette Oct 16, 2010

    Apologize larry_moo748 that I haven't commented back until now. You might check computer repair shops, ('Mom and Pop shops are the best, IMHO), Ebay, or online.

    Not a direct replacement for the harness itself, but you might check if you can install this ATX power on switch into the harness. (Cut the wires from the Power Switch in the old harness, graft this switch back in)

    The Power On button assembly is made of plastic. After age, and heat from inside the computer, the plastic has a tendency to become brittle. Soften the plastic temporarily to assist taking the Power On switch out. There are usually hooked tabs in the plastic assembly, which hold the Power On switch in place. These tabs can break quite easily. Softening the plastic helps to allow one to ease a tab over to one side, (Just a little), and ease the Power On switch out.

    I have used a bowl of hot water, (Not scalding, just VERY warm), to dip the assembly down into. When you test the plastic to see if it is softened, try the above to remove the Power On switch.
    (Granted, using water doesn't seem like a 'keen' idea, but the old Power On switch is going to hit the trashcan)

    I have also use a hair dryer set on low heat. Keep the hair dryer nozzle moving back, and forth while you heat the plastic.

  • joecoolvette
    joecoolvette Oct 16, 2010 Cut the old one out, graft this one in it's place


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Hi it's look like you're right. Can you hear fan from power supply if not it's power supply for sure and it's not neccery costly. You can also check all conection on motherboards. Just get power supply with the same Watts and do it your self. If you need more help let me know. Regards if it help please rate it

Posted on Oct 10, 2010


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