GA-H61MA-D2V Boot order problem

[Scott52]

GA-H61MA-D2V Rev 2.1, F6 BIOS, i32120 CPU

Hi A few days ago I booted my computer and got boot device not found message. I checked the BIOS and NO devices were listed under Boot Option Priorities. I loaded Optimized defaults and computer booted OK. When I checked boot order there were 2 hard drives listed and I only have one fitted. When I try and set the DVD as first boot device the No boot device found message re-appears. I've installed the latest stable BIOS. With Optimized Defaults loaded the boot order is.
1/ UEFI: WDC WD500
2/ SATA SM: CDDVDW
3/ SATA PM: WDC WD500
I've had the board a year and until this issue I've had DVD set as first boot device OK. Hope someone can help me, thanks.

[autotech]

Restart your computer and hit the  end key upon booting. Is the dvd drive listed there?

[Scott52]

Thanks for your reply autotech. Yes the DVD is listed and if I have a bootable CD/DVD I can run it. Although it's quite easy to work around the problem I just wonder why this came about as I've used the computer for a year without an issue. I should maybe mention that I was running Mint 13 and now I'm running Linux Mint 17. Can an OS possibly cause this? Edit:  I've just changed the first boot device to DVD and booted with a Linux live disc and it worked. The problem is if I leave the DVD drive empty and as first boot device I get the OS not found error when I reboot.

[autotech]

Leave it as first boot device and ho to your hard drive config and have it boot off the hard drive in that section.