Portable external hard drive (500gb) not recognized on computer

I have been using a portable hard drive to backup all my files for some time. I plug it in now and the led light briefly flashes and then , nothing. Computer does not recognize it anymore. I really need these files! any suggestions?

Oms2208 wrote:
I have been using a portable hard drive to backup all my files for some time. I plug it in now and the led light briefly flashes and then , nothing. Computer does not recognize it anymore. I really need these files! any suggestions?
what computer?  please provide full model number.  it is printed on back
L305-S5955, T9300 Intel Core 2 Duo, 4GB RAM, 60GB SSD, Win 7 Ultimate 64-bit

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