I shut down and hooked up my USB cable, then attempted to power up. Nothing. I unplugged the USB and attempted to power up again. Nothing. Now I'm worried that this baby may be dead. I removed/re-inserted the battery; tried a fully charged battery from 770, etc....no dice. Finally I started searching online for others with this problem.
It's caused by some sort of software issue regarding a thermal sensor, and is fixed when RX-34_2008SE_2.2007.51-3 is installed.
Having to hold the home button wasn't something I had to do on my 770s.
Now to decide what to do about AIM. I see that there is a beta update to Nokia's integrated chat solution that supports AIM. In order to use this, I would need to do some hacking. I'll probably install Pigeon first and try it both ways.
Two final notes: Nokia should probably strongly consider trying to get existing inventory flashed to OS2008 or some kind of big warning sticker regarding the power on issue. I think a lot of people who are less technical than I am would simply return the device or send it in for repair. This is a pretty lousy first experience. At least it shouldn't be effecting the N810 owners.
Regarding my screen? I'm trying to ignore it as best I can. We'll see how I feel in a week.