UA-25 EX will no longer power on

I have been using the UA-25 EX for about a year or so. It has worked perfectly fine up until this morning. I've been using it as my primary sound card for my desktop for about a month now (before that I only used it when I worked in Sonar X1). Last night I had music playing through the speakers that are hooked up to the UA-25 EX and I fell asleep. When I woke up, my computer appeared to be in hibernation, and when I booted it back up, the UA-25 EX didn't turn on. I tried unplugging and reinserting the USB cable, using a different USB cable, plugging the unit into a different computer, and reinstalling the drivers, but nothing has worked. No matter what I try, no power seems to be getting to it whatsoever. Could I have messed it up by leaving it running all night? Did the computer going into hibernate mess with the circuitry or something? Thanks in advance for any input.