Stupid I know, but I saw my 'home' file was named root and for some reason thought it should be Home so I tried to change it. Meanwhile about half an hour later I had a power cut. On rebooting the computer, it logs me in to a default user with default settings. I know many people have done this before and I've been searching the net all day trying to do everything they say. The main difference is, the name wasn't changed and is still root therefore there is no 'old' file somewhere called home with all my files in that I can just swap over or change the name back to what it was before as most people seem to have been able to do. I've still go the same amount of hard-drive space left that I had before which would suggest the files are on here somewhere. It's an iMac OSX 10.5.8 I've tried everything I could find on the net and really need help!