I have tried numerous times, several different ways, to boot from and run the SL install on my MacBook Pro running Tiger. The DVD spins and makes its normal noises then the grey apple screen appears that the *circle with bars" not the spinning color wheel, spins and spins. I have waited up to 30 minutes but nothing. I was expected to be able to pick the language then do a clean install, but it never moves from the grey apple screen. Any ideas?