Debian :: System Rescue With Hardware RAID

I had a RAID problem on an HP Proliant server due to a failing disk. When I changed the disk, things got complicated and RAID seemed to be broken. I put back the old disk, repaired the RAID, then changed put the new disk again and all returned to normal except the system doesn't boot. I am stuck at grub stage (the grub rescue prompt). I grabbed a netinst CD and tried to rescue it, at some point, the wizard correctly sees my two partitions sda1 and sda2 and asks wether I want to chroot to sda1 or sda2. I had red screen errors on both.

The error message said to check syslog, syslog says can't mount EXT4 file system beacuse bad superblock. I switched to TTY2 (Alt-F2) and tried fsck.ext4 on sda1 (I think sda2 is the swap because when I ran fsck on it it said something like this partition is too small and suggested that it could be swap) it says bad superblock and bad magic number. I tried e2fsck -b 8193 as suggested by the error message but that too didn't work (I think the -b 8193 is for trying to get he backup superblock).

The RAID is as follows : One RAID array of 4 physical disks that are grouped into one Logical Volume /dev/sda, so the operating system only sees one device instead of four (4 disks).