entering the bios is easy. when you turn your computer on you see the POST screen. press delete or F2. its different with some motherboards. From there you can detect IDE devices and it will tell you if your CD-ROM is detected. if not then its probably a problem with that. Instead of trouble shooting it just buy a new one. thats the fun part

Do a reset on your bios, the screen will say something like "restore defaults" or something. have fun.
-josh_rain