Macbook pro turns on when power adapter is plugged in

Sometimes my macbook pro (early 2011), turns itself on when i plug the power adapter is plugged in, and the screen is black and unuseable and I have to hold down the power button to turn it off. Then i turn it back on and all is fine.
It does not happen all the time and I believe it has something to do with my power on schedule (my computer turns itself on at 2:00am and turns off at 7:50am) however it still turns on if the power adapter is plugged in after 8am
Just wondering if this happens a lot or my hardware is dodgy? (has happened on 10.7, 10.7.1, 10.7.2)
Tim

+I always power down my mac mini when not in use and then turn off the surge protector. ... Also this keeps resetting the internal clock.+
Since you have done this as a habit and it is an older machine, I suspect the "watch battery" inside the Mini that powers the Mini's pram needs to be replaced. These seem to get depleted faster when Minis aren't connected to power full time.

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Disk Sleep Timer (Minutes):    10
Display Sleep Timer (Minutes):    10
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olacurrency wrote:
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Genius reservation http://www.apple.com/retail/geniusbar/
on-line https://getsupport.apple.com/GetproductgroupList.action
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Serial Number:          W012859X7D3BA
Manufacturer:          SMP
Device Name:          bq20z451
Pack Lot Code:          0
PCB Lot Code:          0
Firmware Version:          201
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I am not the most computer savvy person so here's a bit of info ...
It's a Macbook Pro 13" Early 2011.2.3GHz Intel Core i5, 4GB of memory.
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Manufacturer: SMP
Device Name: bq20z451
Pack Lot Code: 0
PCB Lot Code: 0
Firmware Version: 201
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Macbook pro turns on when power adapter is plugged in

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