|It may be shown as a unknown device or not there at all any place.|
If you can remove it from the computer then do so and boot up once then power down again and return it and power up. It should be automatically found.
If it is built in to the motherboard it may have been disabled in bios or in either case it may be faulty.
1/3 of highway deaths are caused by drunks. The rest are by people who can't drive any better than a drunk.