External hard drive not openning. i have a lacie external hard drive 250 gb. my computer doesnt

Question

i have a lacie external hard drive 250 gb. my computer doesnt open it
anymore. i have all my information on it. i used it the other day and i
shut down the computer with it connected. it didnt shut down so i
ripped it out (i know, i know, badly done) and it proceeded to shut
down. now when i connect it, nothing prompts me that it is connected.
it doesnt ask me if i want to view files on it nor does it show up in
'my computer'. dont know what to dooo