Hello I have an APC Back-UPS XS 1500 that I'm using for my Mac Pro. I had some issues with it beeping at me all the time, which has stopped. But now it's causing sleep problems with my computer. When the Data Port is connected to USB, the computer won't sleep. I unplug it and it sleeps just fine. Anyone else experiencing this problem? Any ideas on how to fix it? Any help would be greatly appreciated.