Laptop won't recognize CD/DVD or hard drive, but they have power.

When I received the laptop it worked just fine. I changed the boot order to CD first and upon saving and restarting the machine, it somehow reset the BIOS and it no longer recognizes the drives. They have power, because I can open the CD drawer, but in the BIOS it doesn't list them. I thought about updating the BIOS, but you need a CD drive to do that.
(Satellite L355D-S7813) PSLE0U-00R00J
Any help would be appreciated.

It has 1 GB of RAM, so I tried booting up with only one module. Neither one of them solved the problem, although oddly enough in Verbose mode this time instead of stopping on the error the I mentioned before, it continued a bit further and gave a kernel panic. This was the same for each module.
I'm coming to the conclusion that at this point it's probably either the logic board or the CPU, and will probably be expensive to fix -- the warranty ran out in August. I suppose that it's possible both RAM modules are bad, but it seems very unlikely that both of them would be.
I suppose I'll just have to bring it in for servicing and have it checked out.
Thank you for the suggestions.

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