Help on U-Mix Control 1

I have the mixer connected to PC, and he says it is not, i think that the problem is on the mixer. I dont have the installation CD. The power is flashing. The mixer crashed when I finished the section on the PC, and left it a few hours connected to the PC, but when I got back was no longer working. I try on other PC and it's the same problem. I dont know what to do.
I hope suggestions, thanks.

I hope suggestions, thanks.