Macbook Pro 8.2 does not sleep when closing the led.

I have a macbook pro 8.2. When I close the led, it sleeps then wakes up immediately. I can't put it to sleep by closing the led becaus it will wakes up again. So, If I want to put it to sleep, I have to choose the sleep option from apple menu. I am affraid that it is a hardware problem, something wrong in the sensors.

Since this is a 8.2 MBP it is fairly new, I have an 8.2, it has still got a lot of the original 1 year warranty left on it.
Just how do you know it is not going to sleep when you close the lid? Does the monitor not turn off? Does the sleep light on the front not come one and then slowly go out and come on again (flash slowly) when you close the lid?
If the screen doesn't turn off or the sleep light doesn't come on and then flash slowly you need to take it in to get it fixed ASAP.
If those things are happening, the screen turns off and the sleep light comes on then goes out then back on slowly, the MBP is actually in sleep mode. Even if once you open the lid it comes right back to life wvwn if it doesn't ask for your password. This is a setting in system preferences.

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This procedure is a diagnostic test. It makes no changes to your data.
Please triple-click anywhere in the line below on this page to select it:
pmset -g assertions | pbcopy
Copy the selected text to the Clipboard by pressing the key combination command-C.
Launch the built-in Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
Paste into the Terminal window by pressing the key combination command-V. I've tested these instructions only with the Safari web browser. If you use another browser, you may have to press the return key after pasting.
Wait for a new line ending in a dollar sign ($) to appear below what you entered.
The output of the command will be automatically copied to the Clipboard. If the command produced no output, the Clipboard will be empty. Paste into a reply to this message.
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Macbook Pro 8.2 does not sleep when closing the led.

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