After ibernating screen doesnt turn on

Hi there,
My macbook acts strange when waking up after going into ibernation mode.
If i leave it on after a while the screen goes off to save energy(even when connected to the power), the problem is that half of the times if i press the mouse button to awaken it the screnn doesnt turn on...the light under the keyboard lights up, and if i press any buttons i can hear a "bup" noise, like when you press something that you cant do for example, but the screen doesnt turn on and i cant do anything but force the macbook to shut down by pressing the On/Off button.
Any ideas of why this is happening?
Thanks

http://support.apple.com/kb/HT39644

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