Dell Studio 540MT does not start, green power light on, but the Start button / clear stop completely

Looking for assistance

Have a Dell Studio 540MT (purchased in 2009), worked great until 2 weeks ago.   After a temporary system failure would not start.    The power light itself is green fixed.   The power button on the front panel is completely released.

I read a lot of messages and other information about a similar problem.   Therefore, I did following:

1. unplug everything, press the power button / stop for 1 minute and retries.   without success

2. replace the CMOS battery.  without success

3A jumps the Green and black 20 supply connection wire pins to motherboard.  It started immediately food, fans and hard drive.   so I assumed that the PSU has been authorized.

4 replace the motherboard with a new mobo.  Curiously, in a first time, there was no change, but after about 2 minutes, the power button was working and power system.   Everything worked so very well.   I had also completely cleaned all the dust in the chassis and radiator, fan and had applied the thermal paster as directed by Artic Silver.   I even turned off after hours of race and restarted system.  Restarted, he noted that it took a couple times by pressing the power button to make it work.   Then the 2nd day I shut down the system by a normal shutdown through Win 7 and let rest for about 10 hours.   When tried to start/turning the power on again, same problem as the original problem... at first, before light power button would show amber flashing when first pressed the power button / stop, then once I unplugged the power cord and let it sit for 1 hour, the light power button showed no light, completely and again no restarts.

5. I ordered a new power button cord (new)... This could be the problem and replacement will fix?   Is this a known problem that power button can cause this kind of problem?

6 or is a problem of power supply?   But you wonder why the green light of the PSU and works very well when jumping the Green and black wire on the connector 20 pin?     Before I go buy a new power supply to other suggestions?

Is there a known issue with button / stop itself and/or PSU on Dell Studio 540 MTs?

Yes, the front panel can cause failure to start in some models, although I don't specifically remember if the 540 has been affected by this problem. Please let me know if the replacement resolves the problem.

ATX power supplies should work. Here are the standard components of the Dell desktop computers.

Tags: Dell Desktop

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