If so, look around for boot options in the BIOS.
I originally had an SSD with a Windows OS and a 1tb Barracuda HDD in this computer, I wanted more space and faster read/write speeds so I decided to Raid0 four Barracuda HDD's. So I plugged in 3 more 1tb barracuda hard drives. I also dissconnected my SSD from the PC so when I setup raid it wouldnt be erasing the stuff on that (I hoped). I setup the RAID0 with the four barracudas and it said it was fine. I shut down the PC and plugged back in the SSD hoping it would boot up Windows like normal. But now the computer is going straight to BIOS...
ASUS MAXIMUS IX HERO Motherboard
4 x 1TB Seagate Barracuda ST1000DM010 HDD's
250GB Samsung 850 Evo SSD