I had the same thing today, and I did as shadowjk suggested - I removed the battery from the phone for about and hour (I really recommend an hour, just to be sure - because 5 minutes were not enough), then I put the battery back in and connected the phone to the charger. ONLY THEN it started charging again (blinking yellow light), and I left it charging for another hour, then I disconnected it from the charger, turned it on and after it booted I re-connected it to the charger to complete the battery charging to the end.