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all key combinations have failed to produce boot and screen but the vibration responds quickly to the sequenced key combinations. no password issue always seemed to need a reset and extra attention but worked fine until left in partial sun through draped window and was powered on without a cool down. I heard a hiss and though the battery was discharging itself, tried when cool nothing so I put new battery in got a battery icon with low level and would not progress in power from there would not accept the charge . I charged with a new cube led usb charger and data cable overnight got the right results noted above but this time no icon just black screen I dont know what the power level is. I have tried three days charging nothing computer and wall. Tried to make phone vibrate and plug back in no. Windows phone one after mango, have lumia 710 zero problems removed battery twice to reboot phone twice in three years no biggie. Mango 7.5 on 710. want to use 800 as a data phone only would not trust it (mine anyway) for communication. Paid good price for it would like it to work again. Should I try powering it up for a few days? Oh phone always put on a surge protector as all my phones are. I once put phone under my pillow and a few hours later it booted screen came on. Have read people putting hair dryers on them I dont think thats the way to go got me here in the first place. very wonky phone it will and then it wont. I thought maybe usb connection damaged but obviously it is accepting some power and phone responding normally and readily to various key combo prompts but no boot and screen. How might this phone be repaired I would like to know what specifically could be the problem a base power or temp for reboot, what parts I could purchase (out of warranty) all parts inside were connected and looked pristine. No evidence of any heat damage. Used another Nokia battery for this phone new. This phone was let to totally power drain and what I have read that is not good for this phone. Maybe it is only accepting minimal power as before dont know but will try to charge another day to see if any activity occurs but would appreciate any help in zeroing in on what the problem or problems maybe, no software updates if no boot and it should do that if anything.
