Here are some things you can try:

1. Check the safety sensors: Most modern garage doors have safety sensors located on either side of the door near the ground. These sensors are designed to detect objects or people in the door's path and prevent it from closing if something is detected. Make sure the sensors are clean and aligned properly. If they are dirty or misaligned, the door may not close.

2. Check the tracks: Make sure the tracks on either side of the garage door are clear of debris and obstructions. If there is anything in the tracks, such as dirt, leaves or other debris, it can prevent the door from closing properly.

3. Check the garage door opener settings: If the door won't close, check the settings on the garage door opener. Some openers have settings that can be adjusted to control how far the door opens and closes. Make sure these settings are set correctly.

4. Check the garage door opener safety features: Most garage door openers have safety features built-in to prevent accidents. If one of these features is triggered, it can prevent the door from closing. Check the owner's manual for your specific garage door opener to learn more about its safety features.

5. Check the weather stripping: If the weather stripping on the bottom of the garage door is damaged or worn out, it can prevent the door from closing properly. Make sure the weather stripping is in good condition and replace it if necessary.

If none of these steps resolve the issue, please contact us and we will send a professional technician to diagnose and repair the problem. Garage doors can be dangerous to work with, especially if they are not functioning properly. Attempting repairs without proper knowledge or training can be dangerous and cause further damage to the door.