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PC Shuts Off with No Warning!

I've been struggling with this for months and am at my wit's end. Any help anyone could offer would be greatly appreciated!

Basically, without warning, my computer, for no apparent reason, shuts itself off. No shut down. It simply shuts off, as though the power had been disconnected. (It might be worth noting that on starting it back up again, chkdsk doesn't run.)

At first, I though it was a random occurence and likely a hardware problem; possibly the Power Supply. However, my MoBo is set to power up the computer after losing power and, after one of these unexpected power downs, the computer doesn't start back up until I hit the power button.

I've also started to notice a link to downloading. Namely, if there's multiple downloads going on, it seems to trigger the problem. It shuts down almost every night, which is when I've got utorrent scheduled to run, and I've been able to trigger the problem reliably by initiating multiple downloads of podcasts in iTunes overnight. It also seems to happen sometimes when web pages are taking too long to load.

It's probably important to note that the computer functions perfectly otherwise. I can tax the system with the latest games or a heavy set of video transcodes without incident, so I'd have a hard time believing it would be a heat problem.

If it helps at all, my components are as follows:

-Microsoft Windows XP PRO (OEM) (SP3)
-Western Digital 750G SATAII 7200 rpm HDD
-Internal Card Reader with Slim Floppy Drive Black
-Samsung 20xDVD -/+R/RW Dual Layer SATA (SH-S203D/BEBN)
-Corsair VX-450 ATX 450W Power Supply 120mm fan
-DDR2 2048MB(2x1G)PC6400 800Mhz Hyper Memory with blue heatspread Kings
-Creative Sound Blaster X-Fi Xtreme Audio Card PCI Express -Gigabyte GF8800GTS PCI-E 512MB GDDR3 650/1940MHz Dual-Link
-Intel ATX E8200 CORE 2 -Gigabyte EP35-DS3 P35 1333Mhz FSB DDR2 1066 SATA2 Raid GLan

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  • Anonymous Feb 19, 2009

    Thank you so much for the suggestions.

    I have yet to try installing an add-on Network Card (All of my local comp shops are waiting on orders of them!!!) but I did have a look in the BIOS for the Hyperthreading setting and couldn't find one. Could it be called something else?

    For the record, my MoBo is a Gigabyte EP35-DS3 P35 running an Intel E8200 CPU.

  • James Allen Feb 19, 2009

    P.S.- Just tried swapping out the Network card and was able to get the same problem, so no dice there.

  • James Allen Feb 20, 2009


    Just tried installing a seperate network card and disabling the onboard one. no joy.



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Hyperthreading is not active in a dual core system. It is a software phantom core that is used for single core processors that support hyperthreading, eg Pentium IV 3ghz and above.

I think your problem lies in the power settings that you have selected. This problem appears when incompatible hardware is present on the system and you have allowed the system to go into standby and/or hibernate mode. Pull up your power settings in the control panel and make sure that no standby or hibernate options are selected. See if that helps.

Posted on Nov 15, 2009

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Check in your Bios to see if hyper-threading is turned on. Hyperthreading will cause some strange things in windows xp sometimes, including sudden shutdowns. If hyperthreading is turned on, try shutting it down & work on your downloads, if that doesn't cure it, try changing out your network card. Sometimes a chattering network card will cause too many collisions, and will on the odd occasion will cause sudden shutdowns. If you have a built-in nic, disable it in the bios & add a pci nic card temporarily to see if that clears it up.

Posted on Feb 18, 2009


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SOURCE: PC Shuts down suddenly without warning

Hii, for this problem of solution, you need to change your power supply and try a new one (400 watts) power supply and than try. Otherwise there is fault in your motherboard.

Posted on Mar 12, 2009

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PC Shuts down suddenly without warning

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