If none of that works, hopefully its less than a year old, and THAT is covered by warranty, as long as it has no water damage or major physical damage. if over a year old, hopefully you have insurance.....
thanks man ya iv sent it in to be looked at and it water damage its costing $90au to fix lucky i got it off ebay for $30 but the bloke said in perfect con exept sim slot not read cards. but anyway its being done now