My Macbook "blacks out" and then turns back on?

There are times when my MacBook will "turn off" or "black out" and then after a few seconds, it would just turn on again with all the applications I was opening opened up already. Please help? This has happened 3 times now. :/

Looks like you have a 2010 Macbook. Are you running 10..6 Snow Leopard? Things to check. Go to system preferences/energy saver/ schedule and make sure nothing is checked. Also uncheck put hard drive to sleep. Do a pram reset/Command/Option?P/R and hold power button down for three chimes. You could also reset SMC. Hold down the Command?Option?Shift while holding down the power button for about 10 second. You should be able to access the apple hardware test by starting up and holding down the D or Option D on startup. Run the test. If not and you have the install disks you can run it from there by inserting it and doing the same thing. Use disk utilities in the utilities folder to repair disk permissions and verify your hard drive.  If it needs repair ,you'll need to use the install disk to do it under utilities at the top of the screen. If you have a newer operating system ,Then the only way to do this is through the restore partition by starting up and holding down the option or option r.You could look in your library system fold logs and see if you see anything under crach report that says thermal. Let me know.

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