no serial number ?

[tridge at samba.org]

I've got a B2-1 which I've just upgraded ready for a demo to a local
Australian senator. Unfortunately I've been bitten by the activation
process.

At powerup it says "S/N Unknown", then 

  could not activate this XO
  Serial number: SHF00000000

When I try the activative procedure, I instead get:

 No serial number in mfg data
 No serial number
 User power button to power off

plus a sad face icon.

Any suggestions? 

Under the battery cover it says "b2-7" and gives a serial number of
SHF70600215 

Cheers, Tridge

PS: Are there any other olpc owners in Canberra who could bring a
machine along to a meeting with Senator Lundy next week?