I installed windows on my early 2010 MBP, and it's been working perfectly so far, but today when I woke up and had to use windows, nothing seems to happen when I hold down (either) ALT when booting. I filmed this with my phone http://www.youtube.com/watch?v=jkdRfcxmBuU to help you see what my problem is. I press the power button, it makes that boot sound while I hold ALT down. Then it just shows the mouse without the two harddiscs. I'm completely new to mac, so I don't know if I can fix this easily, or I have to re-install windows (7). Or if it can be fixed with the OS X dvd that came with the MacBook Pro. If specs is needed, this is what I'm running: Early 2010 MacBook Pro 15" i7 2.66 4 gb ram 7200 rpm harddrive HR Glossy screen FIXED! My USB hub apparently stopped windows from showing up. Strange!