unable to login into system using gdm3 nor command prompt
At present I am using Debian wheezy AMD647.0 and I am unable to login through gdm3 nor command prompt.
The gdm displays a round icon continuously and when I try to login via command prompt by pressing ALT + CTRL + F1 the system asks for username and when I enter username as root then it displays no devices configured for root and after that the system asks for password and when I enter the password the system is simply following the above procedure continuously instead of logging into the system.
Previously I have disabled some of the daemons and services and I think so the problem started and I can't remember which I have disabled.
Kindly suggest how to solve this issue.