forget root password 9.1 RC2
 

I just took over a workstation which is run on mandrake 9.1 RC2,
the person who install it have left the company, and the AMD PCB just went dead. So I change a new motherboad but with new hardware, It keep asking me for root password. I am a noob for this, we all use window XP. Please help, urgent and I look bad in my boss eyes. thanks.