This Sony Tower with XP Pro SP3 Will Boot from CD ROM/DVD .. But when booting from Hard drive it won't get past a black screen with a flashing curser. I have looked at the hard drive which is a SATA drive and it works fine in another computer. I have tried repairing Windows but it won't boot. I have tried a new hard drive. I have tried replacing the Sata Cable. Since the machine boots with CD I see the RAM is good and the CPU could it be possible the SATA controller on the mother board is dead?