After booting up my Sister’s PC yesterday I found that I couldn’t log in to the system. It would accept my password, and it would appear to continue into KDE, but it would just turn back around and give me the login screen again.

My first suspicion was that I had screwed something up when deleting a lock on another file the day before, but realised that i was only on normal User permissions when deleting the lock, so it couldn’t possibly have stuffed anything up.

So i searched for a good 10 minutes on Google and found a site about connecting to an X windows display on a remote machine. In the troubleshooting section it mentioned that your machine would have symptoms identical to those exhibited by my problem, if your /home/user/directory no longer had any free space.

So that was it, I rebooted back into Single User Mode(Fail-Safe Option at Grub Menu) and removed a few movies that were on the Desktop. Then rebooted back into normal mode and it all worked.