Have the same problem. I got the console to turn on a couple times since it stopped powering. But then it just stopped. I did not notice a drop in console performance when I was able to play those last few times, when I played it was long too. I thought my brick was dying, and I sent it to be repaired. The person who repaired it said it was working on other consoles. I don’t know what he did, probably replaced the capacitators, but he said the problem wasn’t the brick. I don’t speak much Spanish and live in rural Colombia, so it is hard to say.
Anyways, it is hard to say. Won’t turn on. Maybe if I open the console and clean it up a little and then try. I dunno what to do. People are still on XB360 out here, so I have to look hard to find anyone confident in doing something with this thing. So, facts are, the brick may work, but the console won’t even light up or make a sound. I have done all the power cycling and all the other things people said on this page short of opening the console up and cleaning it. Let me know something guys.