Hibernate Question - Startup Key Sequences

The macBook has a feature such that if it runs out of battery it saves an image of the RAM to HDD and goes into hibernation. We can see this in the System.log as [Aug 15 16:45:59 machine-name kernel[0]: hibernatewriteimage done(0)]
Due to a separate fault my macBook is not then going into Hibernation, it runs until the power fails and of course switches off.
So when I do the restart the macBook does not "see" the hibernate_image and simply reeboots.
QUESTION; is there a keypress sequence [altctrlh, etc] to invoke the last/any hibernate disc image of the hdd?
Thanks in advance for your thoughts.

Try resetting your SMC.
Resetting the System Management Controller >>
-Bmer
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