Whenever I try to boot up my PC, it just skips the OS selector screen(I have another drive with Windows 10) and goes straight to windows 10 instead. Ideally it would allow me to select which OS I want to use, but it doesn't. When I override the boot with my motherboard, it tells me boot manager is missing. I have fixed that issue, only to have CHKDSK run over all my hard drives on the next boot. Most recently, it found and corrected a bunch of messed up files, but it usually finds nothing until it reboots, finally to windows 7. Thanks everyone 
