USB HDD won't start becouse it's drawing to much power???

I've recently moved to Mountain Lion and since then this is the 2nd time i'm getting a message that says:
"Because a USB device was drawing too much power from your computer, one or more of your USB devices have been disabled."
and my external HDD won't start.
I'm really ****** off 'cuz i can't get some importnant data.
I've changed 2 cables, and i've started the same HDD on another computer i hv in the house without any problems..
does anybody hv any idea what can i do to fix this??

man....i know it'll work with power hub, but if i need to hv power hub to start one externall hdd on my mac, well...why do i need that kind of computer the??? c'mon...this is some software issue cuz i can use it at the moment...and i didnt do anything different....just connected my iphone 1st, and then re-connected my hdd and it works...why?? well...i guess that only apple know why...
anyway....with big sadness, if these issues continue happening (like this usb power, then trim support not wanting go enable etc...) i'll move to pc...

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