I see you've asked this before but sadly didn't get much help. Sorry.
When you say "reset" the phone, I take it you mean power cycle the phone? Forcing a reboot? Not a factory reset, correct?
After charging you can wake the phone up with the power button and you can see the lock screen but you can't get past that?
Has it always exhibited this behavior or did it start all of a sudden? If a process is locking up the phone, it could be fixed by removing the offending app (is it's from an installed app) or you could try a full factory reset. If it still does this after a factory reset, then I'd have to assume it's a hardware issue and you should get it replaced. under warranty