MacBook Pro dont wake up properly

I have activated hot corner on my Macbook Pro 17" when I leave my desk for a short time I bring the mouse on hot corner and it goes to sleep. Some time when I move my mouse screen will be lightened and mouse will be visible but login screen wont come up, there will be no option for login and nothing will work, when I press any key it will just give a small error sound as I am clicking or pressing wrong button.
I will lose all of my work and I have to restart my mac from power button.
Plz help

HI,
Try resetting the PRAM. http://support.apple.com/kb/HT1379
If that doesn't help, try resetting the SMC instructions for MacBookPro.
http://www.ehow.com/how4519085management-control-smc-macbook-pro.html
Carolyn

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