Vostro 1520 turns off by itself

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Vostro 1520 turns off by itself

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I have a Vostro 1520 that's about a year and a half old (out of warranty).  A week ago it started turning itself off for no reason at random times while using it.  It did not go thru normal shutdown or go into hibernation.  It just turned off as if someone had just "pulled the plug".  Now it won't even load completely.  It turns on and tries a normal bootup, but shuts down within 10 to 15 seconds.  It does it whether it's on wall power with battery in or out, or just on battery.  Any ideas?  Please don't tell me it's the motherboard!

Thanks

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