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The discoloration problem is due to the near by magnetic field appliances like speakers which are very near to monitors ... so what you have to do is just keep some distance to the monitor from the speakers and other magnetic appliances and then press menu button & just give degauss..
Possible failure of the screen control potentiometer which is found near the line output transformer( fly back -LOT).
Make sure that there is no loose connections on the CRT , failure of passive components ( resistor, capacitor) int he CRT also can bring about low brightness.
Check the grid voltages, the damper capacitors to the GRID must also be measured.
try updating the latest driver for your video and bios. try connecting your laptop to external monitor if both of this didnt solve your problem, i suspected you lcd screen is faulty and need to replace.
You are using a screen resolution that is not supported by your monitor. Start the computer in safe mode and open display properties. What ever resolution and color depth is (usually 640x480 and 16 colors), click OK button.
Restart the computer. Go to display properties and increase the color depth to the maximum value. Set the resolution to 800x600. Restart the machine.
Do you see double screens? No? Great! Now try increasing the resolution to the next level. (1024x768). When you click 'apply' you will be give 15 seconds to say it is OK. So if you see double screens, do not click anything. Display will revert to 800x600 resolution (and you will see only a single screen!)