MacBook go to sleep mode when I use it

Hello world,
When I'm not connected to the sector but I am well on the battery, my screen turns off while I am trying to use it. It is regular and unwelcome.
My configuration battery and energy saving is well configured. I tried to format the hard drive and reinstall Mac OS X and the problem is still there?
This happens while the MacBook is cold, it does not heat.
Can you help me? Does someone has had the same problem and has resolved happens?

The machine going to sleep, screen and harddisk... After 30 secondes, I can get up my computer with moving mouse and the DVDRom make a noise. This bug is known? is it common in MacBook?
Please, excuse my English, I'm French.

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