problem starting up G4

[spencer elliott]

this is what i get when i attempt to start up my G4. it was working fine last night, but now this. is anyone familiar with this?

http://i363.photobucket.com/albums/oo80/SPENCERvex/-1.jpg

sorry for the poor quality image. taken from my iphone3G. the question mark on the disk was flashing.

any help is appreciated.

[dazey]

think it means that it can't find a startup volume. Start up from a boot CD and open disk utility to find out what is going on with your HDD