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On/Off Switch on Tower


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#1
waynf

waynf

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Had a problem with PC Tower On/Off Switch this morning. I pressed the switch, fan started to run, then it shut off, after numerous tries I finally got the pc to power up and stay on. The on/off switch is presently on. On the back of the pc beside the 120 V. power cord receptacle there is another on/off switch. Can I use this switch to turn the pc on and off and leave the tower on/off switch in the on position and ignore it. If not, please advise what is the purpose of the on/off switch on the back of the pc near the power cord receptacle?
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#2
phillpower2

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Hi waynf

Can I use this switch to turn the pc on and off and leave the tower on/off switch in the on position and ignore it.

Off yes but on no, when you initially press the on button you short out 2 pins on the MB header (the +5V stand-by supply from the PSU) this in turn activates the +12V power supply from the PSU.

what is the purpose of the on/off switch on the back of the pc near the power cord receptacle?

It is for emergency shutdown or to prevent accidental activation (by curious children etc).
It is possible that it is the PSU that has an issue and not the on off switch so both need to be checked out.
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#3
waynf

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I solved my problem. The root of this evil was a faulty wall receptacle that was causing arcing where the power cord was plugged in. However i did find out what the rear switch was for. Thanks for your help
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#4
phillpower2

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You are welcome and thanks for posting your solution so that it may help others :)
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