[jemm]

Did you tried to upgrade your os version? You mentioned above it is on contract with Orange and if you have tried to upgrade the os version then the phone is sure not going to work. According to their contract terms and condition if you try to upgrade built in version which is locked to orange then it means you are violating the accepted terms and conditions. This is why after upgrading the version your phone might not work.

The official os upgrade launched by BB is meant for those bb phones which are not locked to any specific network provider. If this is the case then you will need to contact orange.

But if this is not the case then probably your phone's battery compartment is damaged due to some reason. Just replace your battery with a new one and then try. Yes i know your concern but to check the phone if it's battery compartment has really got damaged then it is inevitable for you to buy a new battery.

And if you dont want to spend on new battery (for checking) then just visit a bb shop and ask them to check for you.