I had the same problem with my Surface Pro 2. It worked beautifully for 3 weeks, and then it wouldn't power on. I tried holding down the power button several times (10 secs or more), but no luck. I followed Jeff Roach's advice 3 times (see his post above), and on the third time it worked. I'm glad it's working again, but we shouldn't have to go through all this hassle. This being said, the design concept of the Surface Pro is great. Other tablet makers have tried to copy Apple, but Microsoft's approach is totally different. But if Microsoft wants to increase sales and be competitive, it'll need to fix this problem. It shouldn't be this complicated.