I am a newbie to Ubuntu but have had experience with OSX and Windows in the past. I had Windows 8.1 installed on my 1TB WD hard drive and I had a 500GB WD Hard Drive that I wanted to try and run Ubuntu 12.04 and dual boot Windows 8.1 from GRUB. (I will admit the reason I am doing this is to try Ubuntu to see if I can totally make the switch but I am hedging as I am not sure Ubuntu can do everything I need) The install of 12.04 went smoothly. When I start my computer GRUB starts just fine and Ubuntu loads no problem. The issue occurs when I attempt to boot Windows 8.1 from the GRUB menu. When I do this the Windows 8.1 logo pops up and then after about 1-5 seconds the computer restarts and starts booting up again into GRUB. I have been scouring the forums and have seen this issue but nothing solving it. Windows 8.1 will boot fine if I switch the boot priority in the BIOS to booting the Windows HD first but this is a pain and not necessarily what I was looking to do every time I need to switch OS's. Does anyone have a solution for this?