boot into your install DVD and find out the UUID for your hard drive (the one you are trying to boot)... now when you restart and start up the bootloader process and are waiting to enter boot flags... add "boot-uuid=**enter-your-UUID-here**"

I know its a long string but at least you won't get the devices confused because this is unique...

also, the kernel on the DVD is probably different than the one on your HD (if you've updated to the new kernel)... load the kernel on the hard drive if you can instead of the one on the DVD...

the boot flag "hd(0,2)/mach_kernel.voodoo", or whatever the kernel is named, can be used to load the kernel off your disk0s2 drive.

---