PC keeps booting into bios all of a sudden. I did open up the case when it started happening. Checked all the connections, and in bios the boot order is the same. When I click discard changes and exit it goes back to bios. Only way I can boot to windows is when I click on the drive itself. I don't think its the cmos battery as the mb (asus z87-a) is six months old. Any suggestions of help please. Thanks.