There are two possible causes for this. The most common is a faulty input port for the charger. This is a fairly common problem but easily fixed either by yourself or at a repair store. The other possibility is that the phone's battery is dead and CAN'T accept a charge anymore. This can be solved by simply replacing the battery. Click here for more help: HTC Incredible 2 Troubleshooting

This is normal for the Incredible 2. When the battery has to charge from 0%, it will take longer to turn back on and will stay on the start-up screen for a longer period of time. The phone will restart normally afterwards and will act normally. Click here for more help: HTC Incredible 2 Troubleshooting

Yes, the charger for the Incredible and Incredible 2 are one and the same. The charger is compatible with both models. Click here for more help: HTC Incredible 2 Troubleshooting