Posted on 2007-12-03
Last Modified: 2013-12-11
Hello All,

I have a ASUS P4B motherboard and the switch stopped working to turn on the pc, I have checked all the connections/jumper setting and they seem to be fine, everything was working fine. The green light is lit on the motherboard so the motherboard is getting power, not sure what I should check to figure out if I need a new power supply or motherboard or what?? Would the jumper cable be bad, not sure I have ever heard of that?  I believe the pc was shut down but then would not power back on again, there wasn't any power surges or anything like that.

Thanks in advanced for the help.
Question by:Newbie0000
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Expert Comment

ID: 20396948
Disconnect all the cables except for the power supply.  Use a small screwdriver or other metal object and short the pins on the motherboard where the lead to your power switch connects.  Let us know what happens.

Author Comment

ID: 20396999
I left the power cable plugged in and disconnected the jumper for the power switch on the motherboard and put the screwdriver on that pin but nothing happened?
LVL 15

Expert Comment

by:Robert Sutton Jr
ID: 20397109
It should be 2 pins that you should be shorting between on the motherboard. The ATX-SW or whatever its labeled is a (2) pin configuration. You should be attempting to short between those 2 pins.
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Expert Comment

ID: 20397124
You have to short the two pins together for a second. You're just making the same connection the switch would when you press it.  Do you have a volt meter to make sure your power supply is working correctly?  Have you taken out all the expansion cards?
LVL 66

Expert Comment

ID: 20397208
If the PS is working properly, visually check the board for any bad capacitors for bulges, and leaks (looks like brownish dust on the outside of them.. (like a terminal on a car battery).

for examples....

Author Comment

ID: 20397380
All the cards are out, I have tried to short the two pins again with no luck, I held a screwdrivers against the two pins for about 20 seconds and nothing, The board looks fine. I have a digital multimeter but have never used it, can I check the ps with that?

Expert Comment

ID: 20397467
Yep.  You'll be looking for 12 and 5 VDC.  Here's a link with some tips.
LVL 92

Accepted Solution

nobus earned 250 total points
ID: 20401584
i would test with another power supply first - it is the prime suspect.
You can also test this one on another PC
and check here how much power you need :      
here some good info about power supplies :

Author Comment

ID: 20403358
Hey All, thanks for all the help, it is greately appreciated. The problem was the power supply, all is up and running now. Again, thanks for the help.


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