Firstly, I hope this is the right section to post this. Secondly, It's either I'm really blind because I didn't see any post which is related to mine? Thanks in advance. Alright, here's what happened. I tried downloading Windows 7 on my MacBook, new user btw. I thought the installation was working until it shows a black screen stating "No bootable device -- Insert boot disk and press any key" I pressed 'control + command + start up button' and it was back to normal until again it showed up the same black screen with what's stated in my title. I know one way is to press 'option + start up button', then I have to click Macintosh HD and it's back to normal again. Apologies for the nags before lol. What I wanna ask is are there any ways to stop having the black screen stating "No bootable device -- Insert boot disk and press any key" whenever I start up my MacBook? Cause I kept having the black screen stating that sentence when I turn on my Mac. Thanks again.