Can't change startup disk iMac Here is my situation: I've only the mouse paired with my iMac because I rent the keyboard to a friend. Unfortunately the startup disk is set to a fallacious Windows partition that don't want to boot. It sucks on "No bootable device -- insert boot disk and press any key" so I can't boot in any working partition. So, I've two questions:


There is a way to change boot partition or to go to recovery using only mouse?
If I buy a standard usb keyboard, can I just plug the usb cable and use it to change the boot partition or it won't boot, because of the drivers?
I think you need a keyboard to boot holding Alt ("Option") key, to show boot partition and disks. 
Yes, if you plug in a USB keyboard it simply works. Mac OS X has the driver for standard keyboards.