I've just bought an HTC Desire and it seems to have stopped working.
On startup, I just get the O2 splash page, then it buzzes 7 times, and that's it.
I tried holding down the Vol down key, then the power button, and it gets me into some menu called HBOOT. There is a recovery option in there, but it just reboots the phone, and I'm back where I started.
How do I wipe the thing and get it starting up again?