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Start up problem Vista/ Gateway PC


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#1 Richie Cat

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Posted 01 March 2009 - 08:00 AM

Hi, I'm having a start up problem. When I hit the power button on the tower it lights up. Sometimes only the key board comes on. Other times it can be the keyboard and power light to LCD monitor and no power to the mouse. The mouse uses a red light instead of a ball. When the problem does happen I just keep turning the tower on and off untill it starts up. I have Windows Vista home premium 32 bit and a Gateway GT5464 PC. Are there any fixes I can do. Bear with me people, I'm kind of new to this and I may not how to do some functions in a step to possibly repair this. Thanks

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#2 dc3

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Posted 01 March 2009 - 11:15 AM

Hi Richie Cat, and welcome to BleepingComputer.

This could be one of a couple of things, so let's try narrowing the choices. Please us the instruction below to test your PSU.


The purpose of this procedure is to bypass the motherboard to test the PSU.

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.

At this point you can use a DC Voltage meter to read the different rail Voltages. You will want to insert the black probe into any of the Black (-) sockets, and insert the Red (+) probe in the five different colored sockets, one at a time. Below are the five different colors and their corresponding rail voltages. The Voltages should be within about ten percent plus or minus of the given values.

Yellow +12VDC

Blue -12VDC

Red +5VDC

White -5VDC

Orange +3.3VDC

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.

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#3 Richie Cat

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Posted 01 March 2009 - 06:14 PM

Hi dc3, I have done what you have instructed. Here are the findings. Have a 20 pin connector, jumped out #14 green to black(ground) the only thing that runs is the cd/dvd table. No fans or led's. Measured voltage at pin 14 and have +5.19v. pin 10(yellow),12(blue), 18(white) and 1,2,11(orange) have no voltage. I now have the tower(modem?) hooked back up so I can send this message. The side cover is off and both fans are running and I see one green led light on at the bottom left of main board(mother board?). Hope this is helpful. Thanks.

#4 Sneakycyber

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Posted 01 March 2009 - 06:32 PM

Are you grounding your tester to a Black wire before testing the other wires.They "Should" test accordingly
Yellow = 12Vdc
Orange = 3.3Vdc
Red = 5Vdc
Blue = -12 Vdc
If you did indeed ground your tester to the black wire in the PSU connector than likely the PSU is dead. Also leave your DVD/Rom drive plugged in to create a load on the PSU to give you accurate readings.

Edit: Typo

Edited by Sneakycyber, 01 March 2009 - 06:32 PM.

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#5 Richie Cat

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Posted 02 March 2009 - 05:34 PM

Hi, my ground was always connected when I tested the other wires. What should the voltage be for the green wire anyway? The only way I can make the DVD/Rom run is to jump the green wire to ground. I did not test the other wires while the green wire was jumped. If the PSU is bad what does it look like? Would you want me to back probe the wires with the 20 pin connected? Thanks.

#6 Sneakycyber

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Posted 02 March 2009 - 05:45 PM

You need to keep the green wire connected to ground this keeps the PSU turned on while you test the wires.

Chad Mockensturm 

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#7 Richie Cat

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Posted 03 March 2009 - 06:23 PM

O.K. that clears that up. I'll see what I get. The voltages I'm testing for are for what in the system? As of right now my tower (is it called a modem?) is booting up with no problem. I was told it takes a minute or two to start Windows Explore because of the Spyware Tools Doctor I have. Is this correct? Thanks. P.S. Remember I got +5.19v when I checked the green wire to ground. In an earlier post I was told it was going to be +12v.

Edited by Richie Cat, 03 March 2009 - 06:27 PM.


#8 Richie Cat

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Posted 03 March 2009 - 07:00 PM

I did what you said Sneaky, here's the values. Yellow +12.19, Blue -11.24, Red +5.15, White -5.09 and Orange +3.39. Tell me what you think. Thanks.

#9 Sneakycyber

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Posted 03 March 2009 - 08:04 PM

All of those values are normal. Seems like its not the PSU. But its working correctly now right?

Chad Mockensturm 

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Certified CompTia Network +, A +


#10 Richie Cat

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Posted 04 March 2009 - 06:23 PM

It's been starting on the first try for the last 5/6 trys. Like I said when does start it will take a couple of minutes to connect to Windows Explore. When I got into Windows it was slow to connect to my mail or an article I wanted to read. I heard a "rattling" sound while this was taking place. Was that a processor working? As I write this I might hear the noise alittle bit but it's volume is low.




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