My External Hard Drive used to work on my Macbook Pro but it has now stopped working?

I was using a Seagate Expansion Portable Drive which used to work on my mac just fine.
but lately the hard drive will start humming once I connect it to the mac and then but it wont show up under devices and the blue light on the hard drive wont light up.
I have checked my USB ports, and they are all working fine.
If somebody knows the answer to this question would you please help
Thanks

One can't read the other.
Just to be clear Mac's can read/write FAT32 but windows cannot use OS X Extended. So to use a drive on both systems it needs to be formatted FAT32
FAT32 does have limitations and possibly the best solution is to use NTFS, a more modern, robust filesystem. The drawback here is that OS X does not natively read NTFS so a third party kernel extension is needed.

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