Gnome 3 fallback mode for users and normal mode for root

view story

https://bbs.archlinux.org – HiPlease help me to fix this problem.PROBLEM------------Root was able to login to gnome 3 but user is logging to fallback mode.STORY--------I had arch with gnome 3 installed in my asus k40ij laptop and everything was working fine until I accidentally   destroyed my MBR and a few windows partitions. I recovered  entire data from arch root partition and copied it back to a newly created partition with and ubuntu live CD.I managed to make the arch boot able by reinstalling grub. I was able to login at command line but slim is giving an error like unable to execute login command.Aft (HowTos)