Sudden crash after every 30mins - 1hr

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Just got a new laptop with windows 8, then changed it to windows 7. And i noticed that after a time spanning from 30 minutes to 1 hour, my laptop just crashes and shuts down. It doesn't even restart like in system failures nor write crash dump files. I have tried stress testing my cpu, gpu and memory and they all turned out fine. I tried removing my battery and plugging the power directly to see if the battery was the problem, but it still crashed. All my drivers are updated, so is windows. (note: crashes happened with both operating systems)
Help would be much appreciated.

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How annoying!

Instead of trying to find and fix the problem, since the laptop is brand new and under warranty, I would return it to the manufacturer for an exchange.

Good luck
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By new, i meant I just got it. It's really one and a half years old and I bought it as a second hand unit. Sorry for the confusion.
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Oh well,

The origins of the problem can be multiple.

1. Power supply
2. Overheating
3. Motherboard circuits
4. Faulty ram stick or slots
5. Virus

You need to test all the issues, perhaps a technician can help you.

Good luck