After three months, I am still faced with the same problem. Please anyone do give me some advice.
Hi Ead.. Well you are setting UEFI mode as Enabled.. So after this setting, if you try installing any OS like Win 7 x64 or x86 , motherboard no longer recognizes the Windows 7 installation DVD.
Its not sensing because motherboard didn't sense any EFI file system in that media.. if you want to confirm this scenario then try installing Win 8 (it contains EFI file in it), this will work .
So if you want to install Win 7 OS in UEFI mode then enable "Legacy mode " also. make sure Secure Boot should set as disabled.
I think these setting should work... if not try only legacy option (Disabled UEFI option)