I would recommend (if possible) to copy your important data on an external hdd, using for example the LiveCD Knoppix, and re-install your system.
Does it help if you know I've already got all the important info off the lat top i need?
Well, where's then the problem? If you have all necessary data you need, why not reinstalling?
If you don't know what you have done in order to cause this problem it will somehow hard to redo the steps in order to make it working again.