Help! I can't unsuspend from disk.

[Petrus de Calguarium]

I use kde4, in case that is relevant, with f12.

I decided not to turn the computer off, instead 
selected suspend to disk.

Later, when I got back, I pressed the power button and 
hoped that my session would be resumed.

Instead, a black and white version of the grub menu 
appears, but not one using grub.conf. It does not have 
any options at all and does not recognize any 
partitions or kernels. It is impossible to boot the 
computer into any installed operating system from any 
partition.

How do I break out of/cancel suspend to disk (I think 
this is called pm-hibernate) and simply boot the 
computer normally?