HL-DT-ST DVDRoM GSA-H50L not work after tro...

Power up your system, then when the system boots, just right click on my computer, then properties, then select the hardwares tab, then click on device manager.
When you get to device manager page, try and locate DVD/CDrom Drives, then click on it, if your drive is there, then just right-click on it, and select uninstall, and after this, on that same page, click on 'Actions', and select "Scan for hardware changes". But if its not there. Just click on the "Actions, and Then select "Scan for hardware changes".
This should automatically out it back inside your My Computer page.
Hope this helps you out.
Goodluck!