Question about Dell Dimension 4550 PC Desktop

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Dell Dimension 4550 will not power on but standby light on.

Hello - A friend has asked me to look at her Dell Dimension 4550 PC Desktop. It will not power up. When I opened it up I notice the power standby light comes on. I am concerned that the problem is somewhere in the J9H2 power on switch. I have tried to rule other things out. If the standby power light comes on does that tend to indicate that the power supply is okay? I know it could be many things including the hard drive and perhaps the motherboard itself. I tend to think it is in the power on switch since this is the area that would have taken the most wear and tear from being pushed on and off. Any suggestions are welcome.

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Hey! Normally, I would have said exactly what the previous poster said. It is almost always the power supply. However, I am typing this message from a Dell 4550 that has a bad power SWITCH. I came home from a week's vacation and the PC would not power up - nothing, nada. I saw the green light on the mobo, so I figured it had power. Took the case apart, which is a huge pain. Decided to channel my inner MacGyver and put a screwdriver across the terminals for the power switch. She booted right up and has been running ever since.

The power button on this computer, and most these days, just closes long enough to discharge a capacitor on the mobo, which fires up the power supply. So, jumping it with a screwdriver lets that happen, yet it doesn't go off when you remove said screwdriver. Good luck!

BTW, if anyone knows how I can get another switch (it's installed on a little mini circuit board), that would be great.

Posted on Jul 24, 2009

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In all my years of fixing computers, 98% of the time it is the power supply, 2% the motherboard and 0% the switch. Just because the standby light is on does not indicate that the power supply is functioning correctly. The power supply puts out many different voltages....5v, 12v, 1.3v, and 3.3v. If the 3.3 is working then the standby light will come on but if any of the others are not working correctly then the computer won't turn on at all. You can check the switch by checking the resistance of the two wires that the switch are attached to using a multimeter. When the button is depressed, it should go to 0 and when it is not depressed it should be at 1. I would suggest swapping out with a known working power supply to verify the issue.

Posted on Jun 25, 2009


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