Posted 15 May 2008 - 03:22 PM
Switches seldom go bad, personally I have never seen a bad one. Testing your switch would be the best way to avoid any unwanted contact with the motherboard. Be sure to unplug your computers power supply from the electrical outlet before opening the case. After opening the case remove the power switch plug that connects to your motherboard (with out knowing the computer specifics I can't tell you which one it will be) it will be grouped together with a few other wires routing to the front of the case and to the switch it self. After unplugging the wires using a voltmeter set to continuity test touch the black lead to one wire and the red lead to the other wire, press the switch the tester should beep. If your tester does not have continuity test use the Ohm setting and the numbers should almost zero out depending on the ohm setting you have it set to. If nothing happens replace the case or the switch with a new one. The other thread has links to suitable switches you can use. There are other options to test the motherboard but without knowing the exact model of motherboard and the location of good pictures there is no safe way to describe how to short the PS/On contacts. Shorting the wrong ones could damage the motherboard and possibly shock you. IMO the motherboard is bad and needs replaced but it should be tested first.
Systems and Network Engineer
Certified CompTia Network +, A +