PC WILL RESTART BY ITSELF EITHER WHEN ON THE INTERNET EITHER WHEN FIRST OPENED

I BOUGHT A COUPLE OF WEEKS AGO. PENTIUM 4 AT 3GHZ. IT SHUTS DOWN BY ITSELF. I SENT IT FOR SERVICE. THEY CHANGED ITS MEMORY, AND WHEN I FIRST OPENED IT IT RESTARTED ITSELF. NOW I HAVE IT OPEN AL DAY FOR 3 DAYS. SOMETIMES IT SHUTS DOWN. i CAN MAINLY USE THE PC, BUT IT IS UNRELIABLE. YOU NEVER KNOW WHEN IT WILL SHUT DOWN.

ANY SUGGESTIONS WOULD BE VERY WELCOME
LAVDIOTISAsked:
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Luc FrankenEMEA Server EngineerCommented:
Please don't use the Caps-lock key, it looks like shouting...

Assuming you have either win2k or winXP, I suggest you do the following:
Rightclick "My Computer" => "Properties" => "Advanced" => "Startup and recovery" => uncheck "automatically reboot"

Next time you should get a blue screen, post the error code here, or try looking at http://www.aumha.org/win5/kbestop.htm for possible solutions.

Also, check what the cpu temperature is (try AIDA32 => http://www.aida32.hu if you don't have any temperature monitoring software)

Greetings,

LucF

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StealthMulletCommented:
You may have a piece of software running in the background causing a conflict or it may be a possible driver problem, following the above steps will help you discover the source of the problem.

You can also disable your background software to reduce potential software conflicts:

Start Menu >  Run and type MSCONFIG and clock OK

Click on the STARTUP tab and look through the programs you have ticked there, each one that is ticked is automatically loading into the background of Windows each time y our machine boots. Disable those that are unnecessary and run on as clean a startup as you can without compromising the security of your PC and see how the machine runs.
patrickabCommented:
I go along with LucF about temperature sensors. My guess is it's switching off when it gets too hot.
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Luc FrankenEMEA Server EngineerCommented:
LAVDIOTIS, you might want to take a look at the bios settings also, look at what temperature the computer is supposed to shut down.
blumbraCommented:
I would check the power supply to make sure that you are not having brown outs.  A bad power supply would case serious system instability.  Also a power supply that does not have enough wattage to handle your machine.

Bryan
LAVDIOTISAuthor Commented:
Thank you all.  The pc is for service. LucF helped a lot. PC has  7f, 8e, d1. I bought a ups, so I know it is not the power supply. Also, the pc would bypass the "dont restart" order.
I  just dont understand it. Brand knew PC. Dont they check them? And even when they first changed the memory it restarted the first time I opened it. I wrote to LucF to say that maybe it's the MX 44o graphics card by Nvidia with 128 MB. Or maybe the motherboard. I figure the experts should know...
I bought the PC 18/11. It went for service 28/11, And know again. Well, thanks, all.
Regards
blumbraCommented:
A UPS has nothing to do with the power supply.  That just regulates the voltage to the power supply.  You can have a UPS and still have a failing power supply.

Bryan
LAVDIOTISAuthor Commented:
Please explain Blumbra. The ups I bought is Pulsar Ellipse premium 500. How do I know if I have a failing power supply? The lights don't flicker.
Luc FrankenEMEA Server EngineerCommented:
Most of the time you can't know if you have a failing PSU. You need the right measuring equipment to do that. Your local computershop might be able to test it for you.
Normal home use check for powersupplies: Replace.... :-(

The only thing a UPS does is provide power to your power supply in case of a power failure or fluctuations. The PSU transforms the 230V into the right voltages for all the components inside your computer. If this one fails, no UPS can do anything about that.
LAVDIOTISAuthor Commented:
Thanks, Lucf.  I'll try to get an electrician to check the power supply. Is a power supply replacable?  Why do the lights have no problem?
Luc FrankenEMEA Server EngineerCommented:
Yep, a PSU is replacable, you'll have to check what size you need, just check the sizes of the one you have now. Then get the best PSU you can get with those dimensions (look at the powerrating, I'd say for your system you'll need at least 350W)
LAVDIOTISAuthor Commented:
Is the Power supply Unit for the whole apartment, or just my room?
LAVDIOTISAuthor Commented:
Sorry, the PSU is on the PC. Right?
Luc FrankenEMEA Server EngineerCommented:
Yep, it's in the PC,  if you have a tower, it's most of the times in the upper rear of the case. Lookst like a big steel block with a lot of cables comming out of it ;-)
LAVDIOTISAuthor Commented:
ok!
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