Maybe its not the drive maybe its the software just try this one:

if you are using windows XP

- click start
- click run, in the run type in regedit
you will see a registry editor window
in the registry editor window

- click the + sign at the hkey_local_machine
- click the + sign of system
- click the + sign of currentcontrolset
- click the + sign of control
- click the + sign of class

there will be bunch of random letters and number under that control
try to find this one
{4D36E965-E325-11CE-BFC1-08002BE10318}

if you click this check if you will be able to see DVD rom at the right side of the registry editor window
you must delete the upper and lower filters
after that restart the computer and try to put in dvds


for vista or win7

- click start and type in the start search regedit
after this just do the same thing with the win xp instructions
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try also to update the DVD codec. you can also try to download the most updated windows media player, power DVD or any software/program that have dvd codecs or that acts like a player for DVD

i hope this works.
Pls rate my resolution thanks!!