|So, you have one hard drive. Make sure the computer is turned off and the power cable is unplugged from the back.|
Unplug both cables on your drive (yes, bottom left) and plug them back in...Keep the power connector (the one with the colored wires) and the blue connector straight. Do not try and connect them at an angle. They will fit only one way.
A clicking noise is bad. It means the drive could be dying. This looks like a Dell to me. Look on the back of the computer. There's a white sticker there with the Service Tag number of the machine. Go here: http://support.dell.com/support/top... and enter the Service Tag number. If the computer is still under Warranty, you can order a Warranty replacement Hard drive.
Just an FYI, your CD/DVD drive is at the top left bay (the openings in the front are bays). The third one down is the floppy drive. The component in the upper-right hand corner is the power supply.
"So won’t you give this man his wings
What a shame
To have to beg you to see
We’re not all the same
What a shame" - Shinedown