Thanks for the tip , i went on you tube and found several people who had got the case open , thats the first hurdle.
Before i went for the system functions i gave the connections a good inspection , they are covered in black cotton sticky tape , there are several . The one to the right of the speaker at the base of the battery is about 15mm long has a ribbon cable and clip assembly , the brown ribbon cable did not look fully home and the clip was not fully click shut so i lifted the clip up and pushed it fully home and made sure the clip was fully shut down ! most likly poor assembly at the factory.
Everything else looked OK.
Now measured battery volts , it showed 3.08 volts , i dont know much about li-ion batterys but its marked as a 3.7 volt unit, i figured its not wise to go below 3v . The unit must operate in a narrow voltage band.
Tried again a turn on and there was a very faint glimmer on the screen but that was all .
Tried plugging in the d.c. charger mini d plug and found when moved around in the socket for a moment the screen charging logo came on and read , zero % charge !!!. Next , manipulated the charger mini d plug and the screen read charging , the mini d plug looks like it has been slightly bent over and possibly the internal connections have been fractured causing an intermittent fault.
The unit was also kept in temps just above freezing !!!
So now 6 hours later it reads 100% charged and the unit appears to function ok, the voltage on the battery terminals is now 4 volts.
I think it was a combination of things that lead to the fault.
OK so i,m happy now , we will see how it goes. Deffo going to buy a new charger lead though.
Thanks all for the help.