^Exactly what I was thinking^
You need to go into BIOS by holding either delete or F2 (it should tell you what key to press on one of the first splash screens that comes up) and find an option to set boot order. Change it so that the DVD drive is first in the list, save changes, and re-boot.
I did that many many times and it didn't work
I have Intel Core™ i7 Quad Processor i7-950
6GB of RAM
1000Watt power supply
LG DVD Reader