Powertap pro computer error message

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Hi

My newish powertap pro 2.4 wired computer has thrown a wobbler and just displays APldr at the bottom of the screen.
I have tried changing the battery but the result was the same.
No combination of buttons seems to have any effect.
Has anyone had this error before? and know a cure?
Thanks in advance

Julian

http://tinyurl.com/2nxgub