My WD passport hard drive doesn't show on my computer even after

Hello,


I really need help I got an WD my passport hard drive yesterday everything was going great I copied stuff and opened it on my laptop device and everything was fine until my cousin bluged it into a mac book and some window appeared to her and she didn't read it there was an allow icon but she didn't press it she just hit the (X) button and and since then the hard is not showing anymore on her MacBook when I took it and tried to open it on my device ( win 7 ) everything was going well at the very beginning the small led light was here , the hard drive sound was fine , and the hard was already installed and it showed on my control panel > hardware and sound > devices and printers but when I opened my computer to display some file My hard drive was not there it didn't show up on my computer , I tried that Cmd.exe trick nothing was solved the same problem was here what should I do ? Please i need your answer asap