Hm, I'm currently refurbishing my old N900 that got run over by a car two years ago. It came out surprisingly well, the biggest defect being the snapped flex cable. I ordered a replacement one on ebay, which will hopefully arrive soon. Anyway, that phone ran an old firmware (1.1?) and I can access it over USB without using the screen. Maybe you could try flashing 1.1 (without flashing MyDocs, of course). On a side-note, that phone starts vibrating (in an on-off pattern) as soon as it's booted. I thought that might be some emergency thing due to it being head-less. Does yours do that, too?