External HD won't show up

Hey everyone, this is my first post here. New to Mac but not new to computers so I understand about formatting HDs etc. I have a new Toshiba external hard drive that I purchased on black friday. It works on my windows PC as well as my friends Macbook Pro. However it does not work on my brand new macbook pro. It was originally formatted NTFS but i reformatted it for exFat. Still doesn't work on my mac.
It doesn't even show up in finder or in disk utility. Any suggestions? I really need to get this working on my mac or I just wasted a bunch of money.

Check this list (although it is really to determine if the drive is bootable, it may still contain a clue):
http://wdc.custhelp.com/app/answers/detail/a_id/1787/related/1/session/L2F2LzEvd GltZS8xMzUxNTIzMzIwL3NpZC9ueUFYc1g5bA%3D%3D
And/or you may want to check your model on the WD site to see its capabilities, system requirements, etc.
Also, have you tried a different USB cable?

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AntonBC57,
Turn off the computer.
As you turn it back on tap the F10 key. This will load BIOS setup utility.
Press F9 to load defaults.
Press F10 to save and exit.
When the computer boots back up, check to see if everything is working.
Open up command prompt and run the following command SFC /scannow.
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Here is a link to command prompt.
When you go to open command prompt, right click and run as administrator.
Since it has not been to long since the problem started, you can run a system restore.
This will take the system back to when everything was working correctly without affecting your personal files.
Here is a link on how to do a restore.
Let me know how everything goes
Have a good day.

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Message was edited by: Sue brown1

HELP!! My External HDD won't show up

Hi all,
I've got a WD external My Book 750GB plugged into my MacBook Pro 13 inch via USB. The drive powers up but never shows on Mac nor on disk utility.
What should I do?
I have wedding photos from recently which need to be processed and given to clients!
Thanks,
Fred

Hi everyone,
I've got a similar problem, but with a different external HDD, doesn't seem to be too much off-topic though.
I have had a Buffalo 300GB USB external HDD (can't remember the exact model name, but here's a picture http://www.techfuels.com/attachments/storage/530d1203230298-external-hard-disk-b uffalo-300gb-drive-station-hd-hbu2-series-drive.jpg) for a few years now and have never had any problems. I've only got my first Mac about a week ago and when I plug the drive into my Mac it just doesn't show up, although the lights go on and the disk starts spinning. Disc Utility doesn't see it either.
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Conclusion:
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-the problem is not with my own Macbook Pro, since another Macbook has the same problem
-since it worked before it can't be that the HDD is intrinsically Mac-incompatible
Any suggestions?

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500 GB Western Digital MyBook Premium model number: WD5000E032
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The blue circle lights come on so power is getting to it.
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External HD won't show up

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