DVD Drive not appearing in boot menu?

SS01

Honorable
Jul 21, 2012
32
0
10,530
Well basically, I have an Acer Aspire One D250 Netbook. I have an external DVD drive that until yesterday worked perfectly, but now doesn't appear in the BIOS boot menu. If I use a Linux LiveUSB (The netbook has no OSes at the moment) I can see the drive in file manager. Could anyone help me? Thanks!
 

Unfortunately I need to install Snow Leopard (hackintosh), and all ways to install Snow Leopard from USB require access to a Mac, which I do not have.