i know, it is plugged in and nothing happens.. here was another guy with the same problem and this was the answer:
All you need to do is get into the bios through Win8 which can take a little work, but go to the Win8 settings 'charm' through one of the right corners then to PC settings/General and finally advanced startup (restart).
After it restarts, go to troubleshoot, advanced options, and UEFI firmware settings to get into the bios.
Disable Secure Boot under the bios 'Security' settings and enable CSM under the 'Advanced' bios settings to boot to USB or a DVD.
but i dont have these options in bios