Blackberry 9500 User Guide - Page 155

User Guide Accessibility options Accessibility options Change the contrast You can change the color contrast to grayscale or reverse contrast. 1. In the device options, click Advanced Options. 2. Click Accessibility. 3. Change the Color Contrast field. 4. Press the Menu key. 5. Click Save. Display troubleshooting My device screen turns off When you do not use your BlackBerry® device for a period of time, the screen turns off to conserve battery power. To turn on the screen, click the screen or press a key. My display changed Depending on your theme, display options, such as your font and Home screen background, might change when you switch themes. Related topics Change the display font, 150 Use a picture as the Home screen background, 88 No application opens when I press a Convenience key Try performing the following actions: • Verify that you have not deleted the application that you assigned to the key. • Assign a different application to the key. 153