my wd my book Essential 2.0 is not recognized my my pc but recognized in device management

[mead2006]

having a big issue with my wd my book Essential 2.0 it wont reconize on my windows 7 acer ax1900 -e4102 it did up to 3 weeks ago had it for over a year so it is out of warenty have all my important files on there before it went missing off my pc it was almost at full capasity so i was trying to delete and ove files to my main drive now i can find in in device mangment and it was not reconizeable in disk mangment but now i have a drive 1 but cant change a drive letter or even initlize it now i dont know what to do can someone please help me

[Wizer]

Do not initialize if you want to restore the files

look for data recovery software online 

[mead2006]

now its not recognized on disk magment ethier :/ i cant find it anywhere on the computer 

[Wizer]

Try a different cable or different computer

make sure the drive is connected to the wall outlet