My Western Digital External Hardrive will not turn on.

The clicking sound is caused by the spindle inside the hardrive, because it was not removed properly. Just connect you external hardrive to your computer, if it makes the clicking sound again dont remove it yet, just restart your computer properly. In that way all the devices connected to the computer will be refreshed and properly shut down. If it is not detected still, unplug the haardrive then try another USB port. Recommended ports are at the back of the CPU if your using a desktop. These USB ports have higher voltage output that can power up all external hardrives properly.

Shut down your computer and unplug the device. Then turn your computer back on, log in, wait for it to finish loading, then connect the drive and turn it on.

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for a "duplicate" question.

Dear! It show perfect because 1Gb = 1024 MB so if you calculate it you will find it equal to 298 GB because it is binary system shows while vendors account 1GB = 1000 MB but we format it according to binary machine language so that's equal to 298GB. I hope you have make sense.
Thank You

download the manual from here
http://support.wdc.com/product/download.asp?level1=1&lang=en
choose the correct model and download the manual

when i plug it in, it doesn't make a sound to let me know that it is booting up, and also, the lights in the front of it, only lights up half of the way.

sounds like the hard drive is failing... i suggest you find yourself a data recovery program soon

http://smallbusiness.chron.com/repair-corrupted-hard-disk-drive-data-66855.html

That's normal. Storage manufacturers consider 1 GB at 1 billion bytes (1,000,000,000 bytes).

Computers, however, use base-2 arithmetic, and one kilobyte is 1024 bytes, one megabyte is 1024 kilobytes, and one gigabyte is 1024 megabytes. This all multiples to 1 gigabyte according to the computer is 1024^3 or 1,073,741,824 bytes.

Take 320,000,000,000 and divide it by 1,073,741,824 and you get 298.023223876953125, so your computer says your "320GB" drive is 298GB.

There's a standard for base-2 (binary) measurement terminology (gibibytes, mebibytes, kibibytes, etc), but few people seem to use it.
http://en.wikipedia.org/wiki/Orders_of_magnitude_(data)

ok" take a small needle , streighten the pin very carefully.