White Screen freezes

When my MB Pro wakes up (or tries to) all that happens is I get a white screen. It is frozen and I have to poer down holding the power button. How do I avoid this?

With the info given...no idea.

Could be a full hard drive. Need to know what OS it has installed. If 10.7 or higher...you may be able to boot into the recovery partition. If not...you may need to boot the computer from an external device (bootable external HD or USB stick).

- Nick

My OS is MAVERICKS 9.2 - I have a 2012 13" MBP with 16g ram and a 750 G SSD. My SSD HD is less that 50% full. The frozen white screen only occurs when I try to wake the computer from a several hour sleep. Brief sleep - 1 hour or less - I can wake it by space bar and entering my pass word.