Acer DX900 User Guide - Page 273

5. Why doesn't my Pocket PC make any sound? Answer: Tap the speaker icon on the top right of the screen, then select the volume control options, or adjust the volume of the incoming call sound. Alternatively, you may use the volume control key to control the volume. 6. Why does my Pocket PC screen automatically become dark? Answer: Tap > Settings > System tab > Backlight > Battery power or the External power tab. You may find that if you use battery power, the backlight automatically shuts down after 30 seconds by default; the external power shuts down after 1 minute by default. If you think these times are too short, you may extend them as needed. 7. When I want to open a program or file, a warning message "Not enough memory" pops up. What should I do about it? Answer: Because your Pocket PC's memory is shared by storage memory and program memory, the following methods are available. You may choose the one that works best for you. Remove the programs you installed or that are not frequently used to release program memory space. Delete data that is not used frequently or unnecessary to release storage memory space. FAQ 16-3