Not able to login to Administrator Account in 12.04

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http://askubuntu.com – I'm using 12.04. It was working fine till now. Suddenly today it happened to stuck/hang. I was writing Python scripts which went in infinite loop. So I restarted my PC and was unable to login to Admin account. I'm writing this, unfortunately, from my Guest account. I tried many questions but none of them solved my problem. Tried sudo rm ~/.Xauthority from Single User Mode, but it says No such file or directory even when I'm in my home directory Edited /etc/lightdm/lightdm.conf to enable manual login. This didn't work either. [EDIT] I tried using gdm. When I logged in my Administrator (HowTos)