1. Some drives have a dual colored-light.  Normally a green light stays 
   on all the time, and then changes to an orange light when it is being 
   accessed.  If you see two color lights (like at boot up) then this is 
   the case.  If not, continue to (2). 

2. Check that the cable is connected to the proper interface (IDE).  If 
   it is attached to the Panasonic or Mitusmi connectors (same number of 
   pins), the electrical signals will be off and it just won't work.

3. Power off the computer and remove the data cable from the rear of the 
   CD-ROM drive, leaving only the power hooked up.  Turn the computer 
   back on and see if the light still stays on.  If it does its normal 
   flash and goes out, then there is a problem with the IDE port or 
   cable the drive is connected to.  Try a different cable.  If it works 
   then, it was the cable.  If not, then it is the IDE interface.  If
   the light still stays on, then there may be a hardware defect. 
   If the drive is still under warranty, it can be exchanged.  
   Contact Technical Support for assistance.