Is the OS booting OK, and has it always, or is this a recent occurence?
If it ha never booted, you should have a look at the leads and jumpers on the HD(s). Apart from total HD failure, that is the only reason for such a thing.
It is apparent that the CD/DVD is the first bios choice in your sequence. But if, as you say, no HDs or CD/DVD options are showing in your Bios options, then I am afraid, other than the previous suggestiions in this thread, I cannot think of any other remedy. Even if your HDs etc were not working (unlikely for both!), but connected correctly, they should still show in the bios as a priority choice.