I am having the same problem...I have a mid 2010 MacBook Pro Unibody and I just replaced the HD with another that I had formatted from my Toshiba. I partitioned it for the MacBook so that I could install OS X Snow Leopard onto it, however whenever I boot from the disc, it hangs at the white page with the grey Apple logo on it. No install menu, nothing. It's beyond frustrating and I am not about to waste my money going to a professional. Any advice?