Macbook air not going to sleep

my got a new Macbook Air 13 in. but it doesn't go to sleep, also the fan run all the time at 6000rpm or above. So my battery is only good for 2 or 3 hours.
Went to apple store genus bar thye changed some settings and got rid of some program. But it still doesn't sleep. if I close the lid at night it stay on all night with thw fan running.
Any help, information will be helpful.
Thanks

Redwizard wrote:
Went to apple store genus bar thye changed some settings and got rid of some program. But it still doesn't sleep. if I close the lid at night it stay on all night with thw fan running.
Bring it right back to the Apple store and tell them what they did to try to fix the problem did not work.. They are responsible for fixing it since it is still under warranty.

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