Cannot start Dell Studio XPS 9100 - is the PSU?

These symptoms are compatible with a faulty PSU?

I have a 4 years, processor Dell Studio XPS Desktop Intel i7 960 (expired warranty) 18 GB DIMM: 64 Bit Windows 7 ultimate OS.

Computer will not start. (Dell 0M1J3H 525W) POWER supply has a green LED on the back of the envelope of the computer with a black switch diagnosis. When the computer reads the green light is on.

If I press the Start button nothing happens - the white light on the Start button does not illuminate. But if I press the button to start for at least 12 seconds then release and press it again the logo Dell at the edge of the bezel turns on for a second and the fans turn at 20 degrees, but the computer does not start and there is no light on the Start button. The same thing happens if I press the black test on the power supply switch after the button of start for about 12 seconds. If I quickly press the test switch repeatedly from 40 to 50 times, four fans will turn a little bit but stop as soon as I stop to press the test switch. If a power is to learn in the light of the collar and the fans, but the computer starts and the green light does not go or flash. As directed by Dell, the green light is supposed to be activated when the current flows through the power supply and the green light is supposed to flash if I press the test switch when the computer is turned off.

More Dell' diagnostic instructions I disconnected the motherboard and all the readers and the video card in the PSU, but the test was always negative, that would normally indicate a defective power supply.

However, if the front bezel blinking on and fans to be powered for a fraction of a second, which excludes a failure of the power supply?

GENERAL INFORMATION: One night several months ago fans have started racing as the computer was overclocking but my meter showed only 30% CPU usage. Computer subsequently began to lose power and restart at random times.  No crash dumps or stop. Just a loss of power and a reboot. Sometimes the auto restart would work and sometimes it wouldn't. When the computer restarts will not it will not re-start and there was no light white or orange, when I pressed the Start button. If I hold the start 12 seconds or more and then released it and press start logo collar flash momentarily, but no start and no other light. I would try restarts several times, sometimes by pressing the button start hundreds of times before the computer would finally boot. When you start the computer it would normally sometimes several days before losing power again.

The last restart was more than a week and the computer normally lasted more than a week until yesterday when he lost power.

I think that the power supply may be bad. But the only other time that I replaced a power supply on an old HP Pavilion. In this case, the computer was completely dead. I'm confused by the momentary illumination of the Dell logo on the collar and the shaking of the power to the fans. Which excludes a failure or default PSU?

The button BIST says that the power supply is bad.  The BIST button isn't the power button.

The LED on the back does not mean that the power supply is good.

The BIST (built in Self test) is LED and button are for.

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Diagnostic features auto power
Some Dell computers have power supplies that include a self-diagnostic function. The test for power button is visible at the rear of the system. This witness is not the same as the power led on the chips on the motherboard (which said also only + 5VSB does NOT work the power supply is OK). Press and hold the switch self-diagnosis of food-
* If the light is green, the power supply works
* If the light is off, get the power supply replaced

Tags: Dell Desktop

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