Background is gray or dingy due to electrical interference.
Cause:
Gray or dingy cast may be caused by electrical power interference from fluorescent lights, laser printer, power lines in walls, or other large electrical devices.
Solution:
Adjust display unit, move it slightly or move computer across room.
Try one of the following, in sequence:
1) Adjust or shift the display unit slightly.
2) Move the display unit to other side of desk and a different angle.
3) Move the computer and display unit across room or to another room away, from fluorescent lights, laser printer, power lines in the wall or another electronic device.
