I have purchased an HP pavilion dv6820ea off Amazon marketplace without a power adapter. I was informed it was easy to find and eventually bought this charger off ebay. However it prooved not to fit and I was wondering if anyone can tell me the specs of the charger I need? All I can find specifically on the data sheet is that it needs to be 90w.

Even better if someone could link to a right charger I'd be appreciative.
I'm in the uk but an link showing the correct spec would be nice!
Thanks in advance,

George

I've got a bit more info...
I'm fairly sure I need a 19v, 4.74a charger and a 4mm external diameter connection is a bit (but not massively) too big.
Any suggestions...