My macbook pro will not recognize my Seagate external hard drive.

Last night it was working fine, but I noticed that  every time I plug in my hard drive there is a bunch of files in my trash bin.  I tried to delete them and my trash bin goes into the negatives and never stops.  I tried dragging those files from the trash bin into the shredder on mackeeper, but that did not work.  I then gave up on trying to delete the files and went to bed.  I woke up and now my hard drive does not work.  It still glows but nothing comes up on the screen.  I plugged it in my brothers computer which is windows and it recognized it (It started to install the hard drive on his computer, so I stopped it).  I also recently removed programs/ applications like ichat, garage band,  and other applications that I never used on my computer.  Just wondering what I need to do to get this to work because all my school stuff is on the hard drive.  And I tried a new cable and it still does not show up.  Please help.
I guess never mind, literally 25 seconds after I posted this message, all of the sudden it recognized my hard drive.  I hope it does not take this long for it to recognize it everytime I use my computer.

I suggest you delete Mackeeper and do not use the Mackeeper uninstaller.  Look at some of the discussions on this forum and you will understand that it is at best a nuisance and at worst malware that has a negative impact on the performance of your MBP.  Here are instructions that you may use to get rid of it:
http://applehelpwriter.com/2011/09/
Ciao.

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