Question about HP Compaq Presario SR1617CL PC Desktop

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POWER AT HOUSE WENT OUT WHEN POWER CAME ON COMPUTER WILL NOT START UP WHEN I PUSH START BUTTON

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  • HP Master
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Suggest you test to see if the problem is the Power On switch, or the Power Supply.

This is a Top view of the motherboard used in a Compaq Presario SR1617CL Desktop PC,

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00496280&tmp_task=prodinfoCategory&cc=us&dlc=en&lang=en&lc=en&product=1144705

Scroll down to the photo of the motherboard. To the right of the Blue and Black ram memory slots, is a whitish connector with two columns of 12 socket holes.

Looking at the motherboard layout illustration above the photo, ATXPWR1 is the connector.

The 24-pin ATX main power cable from the Power Supply, plugs in here.
This is a general example of a 24-pin ATX main power cable, and it's respective connector on the motherboard,

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain24

Observe the photo to the far right.
The Green wire is the Soft Power On wire. Abbreviated as PS_ON.

ANY Black wire you see is a Ground wire.

The Power On switch is bypassed.
The Green wire is briefly jumped to ANY Black wire.

IF, the Power Supply comes on you have a bad Power On switch.
IF, the Power Supply does Not come on you have a bad Power Supply.

This does Not involve any splicing of the wires, nor the wires of the Power On switch.
The preferred jumper wire is a straightened out paperclip, bent into a U-shape.

The top of the U, is wrapped a few times with black plastic electrical tape.
This taped area is for your fingers, and thumb to hold onto.
Turn the U upside down, and the 'Legs' are what is used.

One leg goes down into a socket hole with the Green wire in it, the other leg goes down into ANY socket hole with a Black wire in it.

Where the wires go down the connector, is the Back of the connector. This is where the legs of the U-shaped jumper wire go.

One leg of the U-shaped jumper wire, slides down into a socket hole with the Green wire, and RIGHT NEXT TO the insulation of the wire.
Has to slide down into the socket hole pretty far. Far enough to touch a female metal terminal at the end of the wire.

http://www.molex.com/molex/products/datasheet.jsp?part=active/0002081202_CRIMP_TERMINALS.xml&channel=Products&Lang=en-US

Same thing for the other leg of the U-shaped jumper wire.
Slides down past the insulation of ANY Black wire, and touches that female metal terminal at the end of the wire.

Contact made with the jumper wire is no more than 2 seconds.
The Power On switch is a Momentary Contact Switch.

Voltage used by the Soft Power On circuit?
5 Volts DC.
In comparison two D cell flashlight batteries store 3 Volts DC.

Not saying there may be a small spark. Have you ever played with flashlight batteries, and flashlight bulb when you were younger?
You can wear a glove on the jumper wire hand if it makes you feel safer.

Again;
IF, the Power Supply comes on you have a bad Power On switch.

This fits a LOT of desktop computers,

http://www.directron.com/atxswitch.html

IF, the Power Supply does Not come on you have a bad Power Supply.

You have to get power first before any diagnosing can continue.

Not to get your hopes up, but most if the time the problem IS the $5 Power On switch, or Power Supply.

Past this point it means fried motherboard, and/or Processor, and/or Ram Memory, etc.

For additional questions please post in a Comment.
Regards,
joecoolvette

Posted on Oct 30, 2012

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