use LiveCD cd recovery root data and even to change password
if your root account is a part of VPS system (for Example DO) you might contact a tech support or use "virtual console" in the control panel to do the things
thanks
Hello Sir/Madame
My name is Ledion and I'm a Mechatronics Engineer with a PhD in Medical Physics. I have 2+ years experience on website developement. I have been part of a team specialized on programming as well as many years as freelancer.
Thank You