If an app is locking up your Nexus One, you may need to force the application to close. Here are the steps on how it’s accomplished.

1. From the main screen, press Menu.

2. Tap Settings.

3. Tap Applications.

4. Tap Manage Applications.

5. If the app you wish to close isn’t listed, press Menu > Filter. If it is, skip to step 7.

6. Tap All.

7. Tap the app you wish to close.

8. Tap Force stop.