Motorola HK1223 Owner's Manual page 110

2. When you use Windows Media Player to play a video file, the screen many flashes
ina very short time. This behavior can occur if there are problem with video. To
resolve the issue, you could set the configuration in Windows Media Player, use the
following steps:
Step 1. In Windows Media Player, SLECT[Tools] -
Step 2. SELECT [ Performance]
6-8
[Options....] on menu.
Click [Advanced....]
Installing Software Drivers