On/off power switch problematic

Michael Murphy
Michael Murphy used Ask the Experts™
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Problem switching on power in Dell PC Studio
I have to press the on/off button numerous times before it works.
It does not seem to be a problem of the power supply as the small green light new the power socket (at rear of PC) lights up as soon as I connect to the Wall socket.
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Most Valuable Expert 2012
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Commented:
The switch is merely a signal to the power supply to turn on. It could be the switch itself. More likely the power supply is not discerning the signal. The green power available signal could still light with this defect, so you probably need a new power supply. You can ask a local shop about getting a switch to try.
If this is a standard tower, you can follow the wires from the switch to the motherboard.  You can test the motherboard by pulling the power switch cable from it and shorting the two pins on the motherboard together (a screwdriver works well for this).  If that works reliably, the issue is likely in the switch itself.

Of course, don't do any of what I mentioned above if you don't feel you have the skills to do it safely.

I've done a workaround for bad power switches numerous times.  In the BIOS there is very likely a setting for what to do when power goes out and then comes back on.  I'll set that to automatically start the computer (the other choices are typically to leave it off or to return to previous state).  That way, if you pull the power cord (you have to wait a minute or two until the light goes out) and then plug it back in, the system will start up.  It's not ideal but it will let you get your computer back up.
Top Expert 2013
Commented:
test first with another Power supply, then look at the switch (this often needs more work)
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Top Expert 2014

Commented:
If this is the tiny Dell Studio Hybrid Desktop that's about the same size as a large external DVD drive there's nothing standard about it, look up the serial number at Dell support and see what is listed in the BOM. If you can post the SN we can look it up for you.

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Commented:
Yes, it worked when I changed the power supply.

Thanks to all who responded.
 John has helped me many times.
And Nobus has always been to my back (although he may not have noticed my change of name some years ago).
Great site. Appreciated.
JohnBusiness Consultant (Owner)
Most Valuable Expert 2012
Expert of the Year 2018

Commented:
Thank you for your gracious comments and I was happy to help.  Happy New Year!
Top Expert 2013

Commented:
>>  my change of name  <<  no i did not, you have me wondering now as  how i knew you before?

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Commented:
Edmund Hogan
Top Expert 2013

Commented:
well, i must say it does not ring a bell, sorry.
i can only hope i helped you out in the past

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