Switching to Bootcamp while in clamshell mode

[mcomp112]

Hi all. While in clamshell mode (connected to an external display; lid closed), when I restart my MacBook Pro, while holding down the option key to be able to switch to Bootcamp, the computer just restarts MacOS again and I can't seem to go to the screen to select the OS I want to start up with.

This screen is what I'm trying to get to -- http://tssdr1.thessdreview1.netdna-cdn.com/wp-content/uploads/2012/06/BootCamp.jpg

Any solutions?

PS: I'm using a wireless keyboard with my MBP in clamshell but used the same with an iMac and had no issues being able to switch OS's by restarting.

 

[chscag]

You might want to try with a wired keyboard rather than a wireless one. Whenever I used clamshell mode, I always used a wired keyboard and never had a problem with booting to Windows, even when using rEFIt.

 

[SteveJUAE]

Try toggling the start/boot options in bootcamp assistant from both sides (MacOS/W10) and see if it resolves the problem

 

[mcomp112]

Try toggling the start/boot options in bootcamp assistant from both sides (MacOS/W10) and see if it resolves the problem

I think that's what I'll have to do. Not as convenient though.

 

[SteveJUAE]

I think that's what I'll have to do. Not as convenient though.

I was hoping you did not always have to use this option but would resolve your preferred method after toggling or setting it one way opposed to another

 

[Boneheadxan]

I've tackled this issue for years by long pressing the option key in regular intervals after restart. There is a short time after booting when the wireless keyboard actually connects before the boot option screen. But, it's a hit or miss until you get used to it. I'm not sure if it still works in macOS Sierra as I feel the boot time is quicker and no chime as well. As mentioned above, wired keyboard or setting boot disk before restart is the more reliable option.