Odd

Quick question for all my techophiles

I have a sony DVD/RW +- burner installed in my client machine.
[EIDE]

It reads and writes cds just fine
It will neither read nor write dvds
[it used to do both]

unfortunately reading or writing dvds is something I do rarely
mostly use it for the occasional archive or file transfer
so I have now clue when it stopped working.

when I insert either a dvd I've burned or a movie I've bought
it just says "please insert a disc into drive"

I've spent an hour testing read/write for both dvd and cd
but other than that I've not put much time into it
[I just discovered it and since I have an exam at 9am tomorrow]
[I dont have much drinking time left tonight]

but if anyone has an idea or thought
as to what might be the problem or solution
I'd love to hear your thoughts.

your plural