I have been connecting my external HD to my Mac for 2 years, no problem at all. Yesterday, I could not connect it and appeared the message: USB ports disconnect due to energy. I already checked many blogs and this site for answer. Can someone help me

I have been connecting my external HD to my Mac for 2 years, no problem at all. Yesterday, I could not connect it and appeared the message: USB ports disconnect due to energy. I already checked many blogs and this site for answer. Can someone help me? How can I fix it?

Hi, clara_from_brazi.
Thank you for visiting Apple Support Communities.
Here are some troubleshooting steps that I would recommend when experiencing this issue.  Also, test connecting the external storage device to the computer with another cable as this can be the issue.  
OS X Mavericks: Reset your computer’s PRAM
http://support.apple.com/kb/ph14222
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/ht3964
Apple Computers and Displays: Powering peripherals through USB
http://support.apple.com/kb/HT4049 
Cheers,
Jason H.

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