I'm searching for answers before I just return my new Surface Pro 3 - I'll give all the details below in the hopes that someone else had a similar experience, or can provide me with advice. I bought my Surface Pro 3 on Friday from Best Buy. Over the weekend, I backed up all of my files from my old laptop to transfer them to the SP3. Because I thought that hooking up an external hard drive would drain the battery faster, I plugged in my SP3 to the wall so that there wouldn't be an interruption in the file transfer. I connected my external hard drive to start the transfer. After leaving it for about 30 minute, I noticed it was going into power-save mode so I changed the power settings to never go into power-save mode when it was plugged in (just so it wouldn't interrupt the file transfer). After about 60 minutes, I went to check on the status - the screen was black, and there was no light on the power supply. I pressed the power button: the keyboard lit up, the light on the power supply came on, and a large picture of a low battery charge symbol appeared. This lasted for about 5 secs, and then the SP3 turned off again (as did the light on the power supply). I contacted Microsoft support, and the rep concluded that the power supply was bad. They are shipping a new one to me (it should be here in 6-8 business days - crazy they can't overnight something like that, but that's another story). I was skeptical, so I went to Best Buy and bought a new power supply. Same thing as above: I plug it in, light on the power supply connector does not come on. I press the power button on the SP3, and I get a large low battery symbol for about 5 seconds. After trying out a brand-new power supply, my hypothesis is that the battery in the SP3 is not operating properly, and not taking a charge. I am ready to return this SP3 and get my money back, which I hate because I really liked using it for the 3 days it worked! Before I do this, I have some questions: 1. Has anyone else had anything similar happen? If so, what was the problem and how did you resolve it? 2. I charged it fully on Friday when I first brought it home, but didn't drain the battery fully before starting this process with my external hard drive today. Was that a mistake that compromised the integrity of the battery? 3. Could I have done anything wrong by turning off the power-save mode while transferring files from my external HD while having it plugged into the wall? I can't imagine this would have been outside of the standard operating conditions of the SP3, but stranger things have happened. 4. Am I being inpatient? Should I just leave it plugged in overnight and see if the battery starts accepting the charge overnight? 5. Is the battery inside the SP3 dead? If so, should I just return it at this point (I have 12 more days left in my return window at Best Buy)? Thank you in advance for any helpful responses!