I have a Nexus One  and I believe it was v.2.3.4 that I had upgraded to a week or so ago. I tried turning on my phone the other day, and I also cannot get bast the Nexus logo. It goes blank, then tries again, over and over and over. I've tried pulling the battery out several times, and have left it out overnight, but still can't get it to boot. I've read some people talk about a factory reset. Is that a hard reset somewhere on the phone. I don't see anything.