DVD ROM doesn’t Appear Under My Computer Icon

I am running Windows XP and my PC configuration is like as follow:
Motherboard: Intel® Desktop Board DG41RQ
Processor: 2.8 GHz Intel Processor
RAM: Kingston DDR2 SDRAM
The problem is that I can’t access the DVD RAM and brand is ASUS (PATA) 22x DRW-22B2S. I have tried to resolve it by changing the bus and power cable. Though it is showing a green light but still I can’t see the DVD RW Drive on the drive list. But in device manager the drive in the list and seems like it is completely ok. Please give a reasonable suggestion to get rid of this problem.
