Ernatalo su Gmail wrote on 09/13/2010 06:30 AM: > Hi to all, > i have a server with Centos 5.5 - 64 bit and i done 3 maounths ago > filesystem update from ext3 to ext4. > All things worked fine behind today. > Today i done centos upgrade and now i'heve only GRUB Prompt. > > Can you help me me to strat the sterver without lose nothing? Did you convert /boot to ext4? If so, you may need to either convert back to ext3 or find a version of GRUB that understands ext4. Even if /boot is on ext3 there may be problems if root is on ext4 and mkinitrd is run without the "--with=ext4" switch. Have you tried booting from installation media in rescue mode? Phil