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Press power button and nothing happens


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#1 CHansohn

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Posted 23 December 2010 - 02:01 PM

My cousin who lives no where near me has a problem with his computer. he put it in to hibernate one day and when he came back he hit the power button and nothing happened. the lights come on but not the system or case fans. he cycled power to it and still nothing. I asked him to check the wire connections to see if the power switch got disconnected. it wasn't. I then had him use a small screw driver to touch the two power switch pins together and still nothing. I am curious if this means the mother board is shot? its still under warranty at microcenter but the problem is he would have to drive 6 hours to get it to the one that I bought the parts at.

CPU = Intel i7 950
Motherboard = Asus P6X58D
RAM = Corsair XMS3 DDR3 6X 2GB
Power Supply = Corsair AX1200W
Graphics Card = GTX 580 2-way SLI


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#2 MrBruce1959

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Posted 23 December 2010 - 02:13 PM

If you want my personal opinion, if the computer is still under warranty, I would make best use of that warranty and take it in for repair.

Doing anything else may void the warranty, when it is needed the most.

I know that does not sound like a good option, but at least if the motherboard has failed for any reason, it is covered.

This may not be the case once your cousin tries to do the repair which may make matters worse.

Bruce.
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#3 CHansohn

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Posted 23 December 2010 - 02:23 PM

the computer is custom built so opening the case and trying this won't ruin the warranty.

CPU = Intel i7 950
Motherboard = Asus P6X58D
RAM = Corsair XMS3 DDR3 6X 2GB
Power Supply = Corsair AX1200W
Graphics Card = GTX 580 2-way SLI


#4 MrBruce1959

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Posted 23 December 2010 - 04:23 PM

The symptoms you are mentioning are related to the controllor chip.

The PSU is connected to the motherboard, there is a circuit that sends a signal to the power button on the computers front panel.

This switch is a momentary switch, it sends a signal to the controllor, which in turn sends a signal to the PSU to power up the computer and to stay on.

From there, the operating system has control, where it can command the system to re-boot, go to suspend mode or sleep mode, or command a total shut-down of the system.

The power on button on the computer can exhibit three other options when it is pressed while the system is up and running.

This would be soft power off, this commands the system to do a normal shut-down.

It can put the computer in sleep mode.

It can put the computer in suspend mode.

The settings I mentioned above are set in the BIOS setup utility under the POWER menu.


The PSU could be the culprit here, or there is a power connection between the motherboard PSU that is loose.

So we can not rule the motherboard as being the device with the problem.

Here is a simple test your cousin can try, I suggest you point them to this thread if they can get on line, as it would be most difficult for you to explain it over the phone.

WARNING: THIS POST MAY CONTAIN DIRECTIONS THAT INCLUDE WORKING WITH LIVE VOLTAGES OR PARTS INSIDE A COMPUTER'S POWER SUPPLY THAT CAN CAUSE SERIOUS ELECTRICAL SHOCK OR SERIOUS BURNS, A POWER SUPPLY CONTAINS VARY LARGE ELECTROLYTIC CAPACITORS THAT ACT JUST LIKE A BATTERY OR VOLTAGE STORAGE DEVICE, THOSE AND OTHER ELECTRONICS FOUND INSIDE A POWER SUPPLY CAN STORE DANGEROUS AMOUNTS OF ELECTRICITY HOURS OR EVEN WEEKS AFTER ALL ELECTRICAL CURRENT HAS BEEN DISCONNECTED FROM THEM! PLEASE USE EXTREME CAUTION AND COMMON SENSE WHEN WORKING WITH POWER SUPPLIES OR AC VOLTAGES!


The purpose of this procedure is to bypass the motherboard to test a ATX PSU.  Some manufacturers Like Dell have used some non ATX PSUs which have a different pinout for the 20/4 pin connector, please confirm that your PSU is a ATX type before using this procedure.

Caution:
This procedure will involve working with live 12VDC electrical potentials which if handled improperly may lead to electrical shock.  Proper precautions should also be taken to prevent electrostatic discharges (ESDs) within the case of the computer.  For safety purposes please follow the instructions step by step.

First, shutdown your computer. Then unplug the power cable going into your computer.

Once you have opened the case, touch the metal of the case to discharge any static electricity.  

The connector of the PSU which connects to the motherboard is readily recognizable by the number of wires in the bundle.  To disconnect it you will need to press on the plastic clip to disengage it and then pull the connector up and away from the motherboard.  Please take notice of the location of the locking tab and the notch on the socket of the motherboard, this will only connect one way as it is keyed.  This wire bundle will have a memory of the way it has been installed and will want to bend back that direction, you may have to play around with it to find a position that the connector will stay in the same position while you run the test.

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From the top left to right the pins are 13-24, the bottom from left to right are 1-12.

  
Please notice that there are PSUs with 24 pin and 20 pin connectors, the location of the green wire in the 24 pin connector is #16, and the green wire in the 20 pin connector is #14.  If you look at the connector with socket side facing you and the clip on the top the number one pin will be on the bottom left corner.  This makes the pin out for the 24 pin connector from left to right 13-24 on top, and 1-12 on the bottom.  The pin out for the 20 pin connector from left to right is 11-20 on top , and 1-10 on the bottom. If you look at the connectors you notice that these are sockets that fit over the pins on the motherboard where the PSU cable attaches, this is where you will place the jumper.  For a jumper you will need a piece of solid wire about the size of a paper clip (20-22 awg), preferably a wire with insulation.  It will need to be large enough to fit firmly into the socket so that it will not need to be held in place while testing.  You are at risk of electrical shock if you are holding the jumper when you power up the PSU.  Insert one end of the jumper into the socket of the Green wire, and insert the other end into the socket of any Black wire.

Once the jumper is in place plug the cord back in. If the PSU is working properly the case fans, optical drives, hdds, and LEDs should power up and remain on.  I would suggest that you not  leave this connected any longer than is necessary for safety purposes.

To reconnect the 20/4 pin connector unplug the power cord, remove the jumper, and reconnect the connector. Take a moment at this time to make sure that nothing has been dislodged inside the case.

This will help determine if the PSU is at fault here or not.

Bruce.

Edited by MrBruce1959, 23 December 2010 - 04:27 PM.

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My Career Involves 37 Years as an Electronics Repair Technician, to Which I am Currently Retired From.

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