On Sat 29 Sep 2012 at 12:04:38 +0000, Hadi Motamedi wrote: > Thank you very much for your help. But unfortunately, the grub boot > loader screen is not enabled in my case here. Is there still any > solution that I can solve my problem or I need to try fresh OS > installation from scratch ? Someone is bound to ask how you are booting if you are not doing it from GRUB. Unless you mean you do use it but have dispensed with displaying a GRUB screen.