MacBook refuses to wake from sleep!!! Please Help!

10-11  Source: Network gathering  Views:1 

MacBook wakes from sleep mode for about 2 seconds then the screen just goes black. It seems as if the computer wakes from sleep properly but then screen only appears for a brief time. I did notice that my settings (background etc.) seemed to have been restored to default, not sure if this helps. Order of events below.
1. I hit the space bar
2. Computer makes noises then screen pops up
3. About 2 seconds later the screen goes black
4. Process repeats
Please Help...
I would suggest running some system maintenance and see if that clears it up. Have a look at the following:
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