I have actually done everything mentioned on the web document that is possible to do before posting on here. The only thing I can't do is remove batteries as there is no access to do that on this model event though the document says it is for this model. The power unit etc works only sometimes it says the secondary battery does not charge and following calibration always says the secondary battery needs calibrated. I am not actually convinced that the secondary battery doesn't charge as I still seem to be getting a good life out of the battery power. May investigate that more first then failing that it looks like and HP warranty call. Thanks for your help though.
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