I just replaced my HD with a scorpio 320gb. I inserted the OS 10 Leopard disk (I lost the original install disk). it makes the normal DVD drive and a hard drive noise, but no mac start charm, and nothing on the screen, no flash, nothing. just blackness. this was an hour ago, nothing new. please help! I disconnected the sleep light that is mounted near the screen release button because I hate it, that cannot be the reason, can it? I need this computer for school, asap. any info would be nice. MacBook pro 1.83ghz 2gb ram. new 320gb scorpio HD.