Not detecting my DVD+-RW

I bought pacific digital dual format dvd drive on friday. I connected it to my computer (Dell 2400 Mhz, 512 MB, Win XP home SP1).

Its able to detect CDs & its able to play songs. but its not recognizing DVDs. Even its not detecting Blank DVD-R, DVD+R. Anyone had some problems?

Any help will be appriciated.

Thanks in advance.

Check your BIOS settingsā€¦