new battery if its not holding a charge
OH!! I remember reading a thread somewhere once where somebody had a similar issue ... well kinda; they used their phone until the battery completely drained and then couldn't get it to charge.
Any way, I remember them saying they had to leave it plugged in for several hours. Even though it appeared as if it wasn't charging, after a while it worked.
Don't know if this applies here, but I'm just trying to think of a solution ...
If you can get it to at least come on, you could try flashing the stock .sbf to see if you can get it to charge again. When it came up, was the battery indicator blank on the main screen, or did it have a battery symbol that was blank?
^^ What Yank said..... Put your phone on the Wall charger (not computer) for at least 2-3 hours and you should be able to boot up after that. Droids do not like to flash roms or anything once the battery is below 40%. I usually will not try to flash anything if my battery is at or below 60%.
First I would try allowing your phone to charge for several hours then try to reboot into recovery. It would seem no one else is addressing the other problem of no service which would indicate a rom that failed to install correctly or an interruption while flashing something.
As long as you can boot into recovery your phone is not bricked. Download custom rom of choice using computer. Place that. Zip file on SD card and rename to update( do not rename "update.zip" the. Zip file extension will be added automatically if using win vista or win 7) reboot holding x and power into recovery, now select install update.zip. once finished you should be good after reboot. I would suggest simply stunning v4.5 as your custom rom but, rom stability varies from phone to phone and user to user. Don't ever listen to somone who says such and such is the best rom. It is all based on opinion and the best to one person could be the worst to another person.
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You may have totally sapped your battery while flashing. Have you tried letting it charge for an hour or two with the wall charger? This has never happened to me, but I have read many threads where people's battery fully discharge and take several hours to charge back up.
Otherwise, I agree with the others: possibly the battery OR the charger itself??