I've been running a dual-boot set up via Boot Camp for quite a while now, but wanted to install the Mountain Lion preview to test out AirPlay mirroring (I've been using AirParrot lately). I partitioned part of my HDD (this is the same drive that has Boot Camp on it) and had no problems with the install. Mountain Lion is set up and I can now boot to it, but the option to boot into Windows has now disappeared and I get the "No bootable device - insert boot disk and press any key" message. I can still access Windows through Parallels, however. Will the option to boot into Windows return when I erase the Mt. Lion partition? rEFIt would probably fix this problem, but I'd rather not have to rely on it. NOTE: I did get a "warning" message that Boot Camp might not work after partitioning my drive, but I paid no attention to it. Are you only allowed to have two operating systems? I'm not really worried about having to reinstall Windows because theres nothing important on it; it's just an issue of time. I'm just wondering if anyone can help me figure out what caused this problem. Thanks in advanced.