Help! /dev/hda as root-partitition isn't recovered

Hello! Help! Something went wrong on my installed SuSe-System 7.3 on my PPC Cube. I pressed the reset-button (ok, I know, I shouldn't, but what else shall I do, when the keyboard won't react) Now, my root-partitition /dev/hda12 can't be recovered/started up. As I am e beginner with Linux, I don't know what to do, and, the SuSe CD Nr. 1 isn't helpful as recovery-CD as far as I know... Thanks for help. Peter, Berne, Switzerland