PRJ

My Seagate harddrive with years of information & backup of multiple computers suddenly went blank - says "This folder is empty" As far as I know it was not dropped. I did not delete the files- I am wondering if my 5 year old was playing with my computer when I had stepped out - but the possibility that he can delete files is very very slim I have hooked it to multiple computers - same result (: Any suggestions -will really appreciate !!