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PC Shuts down suddenly without warning

\015 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 thought 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. 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. Based on suggestions from others, I have tried replacing the RAM and Network Card, but neither has had any impact on the problem.Any help anyone can offer would be greatly appreciated.\015

Answers :

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.
As u would 1st know that there is a perfect power supply of 220-230V,
& if Yes try replacing the SMPS, If you still hve the same prob thn its, Motherboard problem, As i am a technical person & Faced many problems like these.......
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