Lenovo IdeaPad Y430 User Manual page 68

Chapter 4. Troubleshooting
Incorrect characters appear on the screen.
Did you install the operating system or application program correctly? If
they are installed and configured correctly, have the computer serviced.
Missing, discolored, or bright dots appear on the screen every time
you turn on your computer.
This is an intrinsic characteristic of the TFT technology. Your computer's
display contains multiple thin-film transistors (TFTs). A small number of
missing, discolored, or bright dots on the screen might exist all the time.
A message, "Unable to create overlay window," appears when you
try to start DVD playback.
-or-
You get poor or no playback while running video playback, DVD
playback, or game applications.
Do either of the following:
If you are using 32-bit color mode, change the color depth to 16-bit
mode.
If you are using a desktop size of 1280×800 or larger, reduce the
desktop size and the color depth.
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