CD-ROM
In this case it looks like your PC hasn’t installed a default driver for your CD-ROM. Try going on the back of your CD-ROM and clicking the drive to slave and then try starting it up. If that doesn't work try flicking the switch back to master. Does your CD-ROM work when you are in your OS? If it doesn't, your CD-ROM is broken or your BIOS are acting up. Before replacing anything do some tests like changing your CD-ROM with another computer for a test? Try to pin point the problem. Could save you some money.
