The screen happens to be the most common item damaged on the Atrix HD, and there is some good news for those who find themselves in this situation. If the screen is cracked, replacing it can be done with just a few tools, patience, and a good replacement guide. You'll need to supply the patience, but this link will provide you with the other information you'll need to assemble a tool kit, and replace that cracked screen! Motorola Atrix HD Touchscreen and LCD Replacement
If you are using a Motorola brand charger, and the battery is dying quickly, first check to make sure that you don't have applications running in the background that may be the cause. If you eliminate the charger and the programs from the equation, you'll need to replace the battery. Fortunately, the battery can be replaced. If you need to replace the battery, follow this link for instructions: Motorola Atrix HD Battery Replacement
If you have cleaned the lense of the camera, it doesn't have visible external damage and still won't take clear photos, it may be malfunctioning internally. If you follow this link, you will find troubleshooting options for your camera: Motorola Atrix HD Troubleshooting
First, make sure you check the sound settings and ensure the external speaker is not set on mute. If you repeatedly listened to the speakers at full volume for an extended time , you may have damaged the speakers. The external speaker can be replaced by removing the back chassis of the phone.
There are a number of reasons that could happen, a good place to start would be to charge the phone for 2-3 hours with a genuine Motorola wall charger. If no green LED light shows up on the display, there could be more significant damage to the phone