Help, new to Macs. I have a Mac Book Pro which I upgraded to Lion when it launched. Machine has been slowing down during the day, so I eventually turned it off, and than back on again, hoping it would solve the problem (too many years of using PCs has shown me that this often solves most problems). Wrong! All I get now is the grey Apple logo and the spinning thing. I've tried rebooting while holding down shift key, and also by holding the cmd, Alt, P & R keys. And I've tried using the original disk that came with the laptop. Nothing works, and now the disk is trapped inside the optical drive bay. Pressing the eject button has no effect. Can anyone help, or should I have stayed with PCs?