Issue installing SteamOS - VirtualBox by Oracle

[Galaxy366]

I decided to go with the VirtualBox aproach and first of i got a error that ended me changing something in the BIOS. It was Intel Virtualization which was set on disabled but had to be on Enabled.

So VM launches this time but now i get the message: FATAL: No bootable medium found! System halted.

Anybody knows what i might be doing wrong? I clicked the right iso from which it had to install but for now i'm stuck at a black screen with that line of text.

If your wondering about my CPU, GPU, RAM:

Intel i5 2500k
AMD 7950 Vapor-X
12GB RAM

[Legendary old man]

WAG here. Set SATA from AHCI to IDE long enough to see if that works. Change it back later. AHCI drives often require drivers be installed first before it can see the drives.

[76561198118201060]

I think you just need to enable EFI booting in vbox settings. See http://steamcommunity.com/groups/steamuniverse/discussions/0/648814395797000712