Don't know actually what i made to system, it now stuck at pantheon-greeter. Though i have no installation media around please help me to resolve this issue by reinstall or anything via terminal. Actual Problem - "After successful login to greeter black screen shown up for 2 seconds and then back to greeter login"
The error is very similar to what happened to me. And solve it in the following way:
I had been installing and modifying Elementary and I also changed the password of my user and restarted, what happened was that my / home directory was encrypted and by changing the password, Elementary could not de-encrypt / home with the new password. The quickest solution was to put the old password and everything went back to normal.
El error es muy parecido a lo que me ocurrio a mi. Y lo solucione de la siguiente forma:
Habia estado instalando y modificando Elementary y tambien cambie el password de mi usuario y reinicie, lo que ocurrio es que mi directorio /home estaba encriptado y al cambiar el password, Elementary no podia desincriptar /home con el nuevo password. La solucion mas rapida fue poner el antiguo password y todo volvio a la normalidad.