View Full Version : PC random starts and shutdowns

13-01-2011, 04:22 PM
I have an asus a8n5x motherboard which has been working fine for 3 or 4 years. Recently it has not been turning on when the front power button is pressed. It will then randomly start up some time later. Less often it will randomly shut down. I have tried shorting the power pins directly, to check for a stuffed switch, but still no go. What do I look at next? Running XP.

Speedy Gonzales
13-01-2011, 04:30 PM
Try another PSU

13-01-2011, 04:40 PM
There is power to the mb. There is an LED on it lighting up.

Speedy Gonzales
13-01-2011, 04:42 PM
Might have a prob tho

13-01-2011, 06:26 PM
Yeah; We were discussing this in class today.

Could be that your PSU is sufficent until a certain component is used - graphics card for instance and then its insufficent and kills the whole machine.

I'd recommend borrowing a mates PSU(that you know is working) and trying it out for a few days and see if this still happens. If it does'nt you have your problem. If it does report back to us.

Make sure the PSU specifications meet your requirements.

- And I'd suggest you do this ASAP otherwise you risk your powersupply Killing itself and taking other things (such a processor, motherboard and harddrive) with it.

13-01-2011, 06:38 PM
There is power to the mb. There is an LED on it lighting up. That means nothing apart from its partly working -- Take the advice of PCT Joe :thumbs: Even if its to eliminate the power Supply.

Also have a look at the CAPS, look to see if any are leaking or bulging.Example (http://www.google.co.nz/imgres?imgurl=http://bp3.blogger.com/_qXgGaISUk9I/R1Mno5lHm4I/AAAAAAAAANw/Lagy86WIbeU/s1600-R/bad-caps-1-dec07.jpg&imgrefurl=http://loopyfilms.blogspot.com/2007/12/bad-caps-strike-again.html&usg=__pBzSyaA6JnAq5woE3uMH6phZAGs=&h=533&w=800&sz=80&hl=en&start=1&zoom=1&itbs=1&tbnid=znlR04vwKkM_GM:&tbnh=95&tbnw=143&prev=/images%3Fq%3Dbad%2Bcaps%26hl%3Den%26sa%3DX%26tbs%3 Disch:1%26prmd%3Divns)

13-01-2011, 08:37 PM
Thanks guys. I will track down a psu to try.

13-01-2011, 09:37 PM
I'd suspect the PSU first, motherboard second.