What I did was I went to the system Configuration/Boot Mode and replace UEFI Boot to CSM Boot.
Go to same place and change Boot Mode to UEFI + CSM (=Legacy firmware emulation = BIOS).
So you boot by default to hard disk in UEFI mode.
Typing the "boot device selection key" (F10 or F12 or ESC - depends on computer brand) after/during POST
allows you to select boot device - hard disk, CD/DVD, USB, network.
For CD/DVD and USB there are two flavors - UEFI and non-UEFI(=BIOS):
a) select UEFI type of booting from DVD/USB when you install to a GPT style hard disk,
b) select BIOS(CSM/Legacy) type of boot for DVD/USB when installing to MBR style hard disk.
These a) and b) are relevant for Windows 7/8 installation but other OS's like Linux are using the same defaults.
.