Hardware: Late 2009 27" iMac (it's the first generation 27")
OS: Mac OSX 10.7, Windows 7 64 bit on Bootcamp
Last night, I decided to upgrade my OS to Yosemite, and seeing how old my Mac OS is (haven't touched it since 2013, I have a MacBook Air that I use as my main machine), I decided to do a fresh install.
Everything went fine for Yosemite, but after that, my Windows stopped working. It's still showing up in the
System Preferences.app Startup Disk panel, but not when I hold down the ⌥ Option key during system boot up. However, if I try to boot into Windows from the
System Preferences.app Startup Disk panel, Windows will refuse to boot and show an error along lines of
Non-system disk Press any key to reboot...
What can I do to start up as Windows again?