In Suse and Redhat the installation cd has a few but powerful tools, lets call them powertools. These are memcheck86, a very complete and easy to use RAM health check, with this tool i have diagnosed and resolved a lot of memory problems.
The other powertool is the "Rescue Mode", it looks like this:
And after booting, type "root" and you get in without being asked for a password.
This option do not mounts any disk partition, local or remote. Once in the machine mount the desired partition:
# mount /dev/sda1 /disc1
# vi /disk1/etc/fstab
The fstab file has the partition table of the system, it is common that the disks changed and the system is not able to find some partition.
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