I a month old MBP with a bto SSD. When I removed the SSD drive and placed a SATA drive that is NTFS formatted I hear three beeps and the screen stays frozen. I cannot boot from my Snow Leopard DVD. I want to use the 320GB SATA drive when I need more space than the SSD drive. What is causing my inability to boot from the Snow Leopard disc? Thank you for looking?