External HD not mounting since update 10.9, not enough power

Hi,
I have troubles with a Lacie Rikiki USB 3.0 external hard drive since I updated to OS X mavericks: when connected via USB, the disk starts to make noise, but the LED indicator stays off. I have tried several things, from formating the disk in all available formats to downgrading the Macbook pro (mid-2010, 13inches) to OS X Mountain Lion. The disk does not mount and does not appear in the disk utility soft. I have the same problem on a late 2009 iMac, on OS X and Bootcamp since the upgrade. Apparently the disk doesn't get enough current from the USB port, but I can't figure out why.
Thanks if you have any idea.
Rémi Grosjean

If that drive doesn't work on any Mac then it might be the drive has failed. you could also try a Y USB cable that connect to 2 USB ports at the same time to supply more power to it.
Mac notebooks have always had low power output on the USB ports. Mavericks might even lower that trying to save power.

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