750Gb external hard drive stopped working

Hi all. My WD 750gb External hard drive has stopped working. I've tried it on 2 different laptops (one windows, one mac) and its the same with both - the LED lights up and I can feel the internal mechanism spool up, but usually the light starts flickering a few seconds later & the drive shows up on the computer. It never does and the LED never flickers. I've tried other USB cables with no effect. The photos on this drive are vital to me so it's extremely important that I'm able to access them again. I'm freaking out. Can anyone help me?Details are :P/N WDBABV7500ABK-00S/N  Thanks so muchG

Please try the steps provided on the link bellow:

WD external drive is not assigned a drive letter by Windows or Mac OSX and data on the drive is inaccessible

http://wdc.custhelp.com/app/answers/detail/a_id/1164