My external DVD player doesn't work

So i have had this a MacbookPro with Retina for 1 year, and i also have an external dvd player from apple - as the laptop doesn't have one. It was working extremely well until 2/3 days ago when my DVD stooped working and cam up with a notice/warning (with an exclamation mark in a yellow triangle) with the following:

'USB Devices Disabled

Unplug the device using too much power to re-enable USB devices'

Keeping in mind it s the only thing i have plugged in.

I would be grateful for some help 🙂