Can't boot to Tiger!!

A few weeks ago we upgraded from 9 to Tiger at work. I have an old G4 AGP graphics. After installing Tiger I could not start directly into Tiger. I have two drives - one with Tiger/classic and one with 9.0 as a back up boot basically. When I try to start up I get the "No Smoking" symbol. So I have to hold option down at start up to select my old 9.0 back up, start in 9.0 and then start in 10. Very convoluted. I decided to remove my 9.0 back up incase it was the conflict to starting in 10. I still cant boot straight to 10. Now I have to use my start up disk boot into 9 and then boot in 10. I repaired permissions in 10 and verified the disk, no problems. What will happen if I archive and istall 10 again, will that fix it? what can I do to just start straight in 10? Any advice is appreciated. Sorry this is so long.