have you confirmed that the problem is with the Powerbook, and not the external device?

Yup. I can't get my phone or PDA to talk to it right now, and they both talk to each other and the PC just fine.

Also, when I change Bluetooth settings on the Powerbook, it takes a really long time. The little runic B on that top bar stays highlighted for a couple minutes if I do something like change the status of discoverability. That's new. And disheartening.

I'd recommend taking it to a Genius Bar (which I think all Apple Stores have). That way they can look at it right there, and either fix it for you or tell you that it needs to be sent in or whatever.

Apple.com also has a lot of FAQs and message boards devoted to support (although it can be a pain to search through the message boards).

How do you deauthorize music purchased from iTunes Music Store for a particular computer, if the computer is completely dead? (eta: Computer in question is a PC.)

I have an Apple store nearby. I'll take her over this week.

Thanks!

Be sure to make a reservation: [link]

Depending on when you go, there can be a wait for the Genius Bar. At the Chicago store they have a Powerbook at the bar where you sign in. Then they call you when your turn comes.

eta:

Be sure to make a reservation:

Or that. Here in Chicago, they told me I'd only need a reservation when they were busy, like on a Saturday.

The reservations app tells me they can't help me because of high volume -- I can't tell by reading if non Pro Care people can reserve.

IIRC, non Pro Care people can put themselves on the list online, as long as its the same day. You need Pro Care to make an advance reservation.

ita, I don't know which Apple Store you're going to, but I never had to wait more than an hour or so at the Pasadena one. It may have gotten worse, though. The SoHo one is much worse (despite having something like 15 times the number of "Geniuses")

The SoHo store is to be avoided.

TekServe is so much better, although they can get quite backed up too.