Computer Shutting Off Randomly
Posted 13 March 2009 - 07:49 AM
Posted 13 March 2009 - 10:28 AM
The two most common causes of the kind of shutdowns you describe are a failing power supply or an overheating processor. Many times, a shutdown related to the power supply will be accompanied by an audible "click" sound, but a hot processor will simply shutdown without warning or audible cues.
Download and install SpeedFan to monitor the temperatures and voltages. With the "Readings" tab selected, post a screen shot of the SpeedFan window after the machine has run for a bit. If you can't post a screen shot, report the highest temperatures you see and what each of the positive voltages give you for output.
Posted 13 March 2009 - 02:39 PM
Alternately depending on how computer savvy you are you can take out the power supply and either test it if you have a multi-meter, but if you're not comfortable with that I would suggest bringing it to a computer repair store and have them test the power supply to verify it's working correctly.
Posted 13 March 2009 - 03:04 PM
Temp 3 is most likely the Video card and is way too high unless you spent the last 4 hours playing videos or video games. I can't tell from your screenshot just what sensors are linked, that will appear in the box above CPU Usage, but you'll have to scroll up a bit to see it...on my machine it's the video card.
The 5v rail is a little low, as is the 12v rail, but neither are far enough off to cause your machine to shut down.
If you are running a separate (non-integrated) video card, check to make sure the fan on it is spinning and that it's not full of dust bunnies...the same goes for the CPU and CPU cooler. A can of compressed air from a local office supply store can go a long ways towards resolving this kind of issue. When cleaning with compressed air, be sure to gently hold the fans to keep them from over spinning as you clean...it's pretty easy to damage the bearings (even fluid bearings) if you let them freewheel as you clean.
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