Re: i can't boot from installation cd/usb
I often find that bios on MOBO are faulty POS. Even when I set boot order often it will not boot in the order I have set, this is why I have started just hitting F10 (boot options) for my MOBO. Then I get a screen asking me which device to boot from and that works.
In fact just last night I had a friend who couldn't get his computer to boot from a Windows 7 install DVD that was turned into an .iso and put on a bootable USB stick. However, when he went to boot options and told it to boot from a USB, not trusting his changed boot order to work, it did.
So, try that, I think it is worth a shot before more trouble shooting.
"Si Dieu n'existait pas, il faudrait l'inventer" -Voltaire