I can't get the computer to find the hard drive. Turn on hard drive in makes a ticking noise sounds like something is spinning. Then it stops and nothig ever happens. HD Extreme HD2-U2 How can I recover data?

PS3 Clicking noise is associated with the hardware aspect, so that's your starting point it may come from the PS3 fan clicking, so do check out the fan if there's something that might have got stucked in between. Clogs from too much dust or dirt may also cause PS3 clicking sound.

PS3 clicking noise may also come from the hard drive. The hard drive are a bit noisy because of the mechanical parts and moving drive head when reading and storing data. Again, if the noise level is very minimal, there's no worry. PS clicking noise fro the hard drive that becomes too audible may signify that the hard drive is having mechanical problems and may soon broke down. At this point you may want to backup any data you have

I hope this helps you.