Hello, first off a link for downloading a user manual for this computer system: http://us.msi.com/support/mb/Z97_U3_PLUS.html#down-manual
Your optical drive is a SATA drive.
If the drive is not being recognized in BIOS, it could be caused by a faulty electrical connection.
This will require you to open your computer case, so be sure to power the computer off before hand.
I want you to exercise extreme caution to prevent static electrical discharge damage by placing one hand on the metal chassis of the computer case while you conduct the follow procedure.
Locate the optical drive and pay attention to the wires connected to it.
One wire will be thinner and narrower than the other, this should be the data cable, the other end should go to the motherboard.
Disconnect the end on the optical drive and plug it back in again.
Locate the other end of that same cable which should be on the motherboard, and unplug it. Plug it back into the same slot for now.
Next, locate the other wire going to the drive, this should be the power cable coming from the PSU. Unplug it and plug it back in again.
Return power to the computer system and boot it up again.
Go back into the BIOS again and see if the drive is being recognized by the BIOS and can be chosen as the first boot device.
If not, power the computer off and relocate the SATA cable on the motherboard to another SATA port and try again.
Let me know the outcome one way or another.