My Roccat Arvo keyboard is not working when trying to get into the Startup Manager via pressing 'Alt' during startup to go into bootcamp. Is there some incompatibles with PC keyboards during bootup? Because like all pc keyboards in OSX the windows key becomes the apple command and alt and control remain the same. However why is it in this one case where the Alt key doesn't work? I do have Bootchamp which allows me to restart into Windows via menus and you can access Bootcamp in Windows to restart in OSX but for that initial startup and mainly the principle is there a way for me to access the startup manager?