System just shuts itself off randomly...

TC10284

Senior member
Nov 1, 2005
308
0
0
Hey all.

I have an Asus P5W DH Deluxe motherboard with a Pentium D 945 3.4GHz CPU, 4GB of DDR2 533 (3.2GB seen by the OS) and an ATI Radeon x1600 PCIe x16 vid card. Running Windows Vista Business 32bit edition.

Since the other day, I noticed that my office system (the above) has just been shutting itself off for no apparent reason. Yesterday it started doing it and it didn't really matter what I was doing, it would randomly shut itself off. After it did this for the second time, I tried turning it back on again and it would come on for a second and then shut off again. It even shut off on me when I left it idle playing a game on another computer. I am an "experienced" tech so my first suspicion was that it was the power supply. So I ended up switching my Coolermaster 500w with 140mm fan PSU with a new (backup) Thermaltake 430w. Well, after I switched the PSU, for the rest of the day yesterday the system worked fine. I eneding up taking apart the Coolermaster 500w to get the 140mm Fan because the PSU smelled like it was dying. Whilst taking it apart, I also noticed the three or so of the capacitors in the PSU were leaking. Well, my system continued to work properly all throughout the day until just a few minutes ago when I was watching a .asf video in WMP11 and it just decides to shut off on me about 15 minutes into the video. I turned the system back on, reloaded everything, and started watching the video again where I left off. A minute or so later, the system shut off again...
Also note, that I've looked in the Windows even viewer and didn't see any major errors in the event log that looked like it would apply to the shut downs. Even still, if it was a major Windows crash, Windows should BSOD and reboot itself instead of shutting the system off. I have Windows set to only show a BSOD error and NOT reboot anyway...

I also thought it could be something overheating. Well, in the BIOS, the CPU temp is around 55*C and the system temp is around 43*C. SpeedFan reports around 44-45*C idle for the CPU and around 43*C for the system temp. These temps shouldn't be too bad.

I think what may have broken some component that was weak already was the following: I was on a maze creation website that a friend sent me where you can tell it how many rows and columns to generate. Well I decided to go for a large amount to see what it would look like. It took over an hour to process and it still wasn't finished so I closed the website. The shut offs didn't happen then, but a few hours after.

Therefore, I am very worried that it is a major component like the motherboard that it shutting itself off. I was wondering if you guys had any suggestions before I started replacing parts.

 

WT

Diamond Member
Sep 21, 2000
4,818
59
91
What are the specs on the Thermaltake unit, specifically the +12 rail ?? You shouldn't have a lot of power draw from your hardware posted, but the Tt 430 unit, being a spare with some age on it, may not be up to snuff either. Are you sure its a 430, as I had an older 420 Tt unit and it only offered 18a on the +12 rail.
 

TC10284

Senior member
Nov 1, 2005
308
0
0
This is the power supply that's in it. The PSU that's in the system now was NIB and never used. It's probably about 4 months old since I bought it.
http://www.newegg.com/Product/...x?Item=N82E16817153023

And so FAR the system hasn't shut off on me again since the other day. I switched the power cord to the system just in case...just to see if that could also be the problem.
 

Piano Man

Diamond Member
Feb 5, 2000
3,370
0
76
I had a Lenovo Workstation M55 that kept randomly powering off. However, what was weird, was that if did actually boot into windows (sometimes it didn't make it), it would not shut off unless I started doing something on the machine.


I replace the MoBo, PS, Memory, CPU, HEatsink, Fan, Power cord, tried it in different outlet. Didn't fix it.

It was the video card, and ATI x300 or something like that. One of the caps was busted and was shorting the system. I spent 2 days trying to figure it out.

So I say look for busted Caps, or maybe reseat the MoBo in case there's a short somewhere
 

TC10284

Senior member
Nov 1, 2005
308
0
0
I'll check out the video card next time it shuts off.
I updated the BIOS for the mobo to the latest beta BIOS. So I'll see how it runs.
 
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