I have lines over my monitor

Restart the computer
2 While the computer is loading, press "F8" key on the keyboard right before the
computer reads the hard drive or press the "F8" key multiple times in 1 second
interval until the "Windows Advanced Options Menu" appears on the screen
3 Under "Windows Advanced Options Menu", using the arrow key on the
keyboard, select "Enable VGA Mode" then press Enter. Select "Windows 2000
or Windows XP" for your operating system.
4 Wait while the computer is loading and once the computer finishes loading,
5 Right Click anywhere on the blank area on the desktop then click "Properties"
6 Click on "Settings"
7 Click on "Advanced"
8 Click on "Adapter"
9 Click on "List All Modes..."
10 We recommend that for 15" LCD's select 1024x768, True Color (32 Bit) 60
Hz or 1024x768, High Color (16 Bit), 60 Hertz; For 17" & 18" LCD's select
1280x1024, True Color (32 Bit), 60 hertz, or 1280x1024, High Color (16 Bit)
60 Hertz, or
640x480, 256 colors, 60Hertz or 75Hertz
640x480, High Color (16 bit), 60Hertz or 75Hertz
640x480, True Color (32 bit), 60Hertz or 75Hertz
800x600, 256 Colors, 60Hertz or 75Hertz
800x600, High Color (16 bit), 60Hertz or 75Hertz
800x600, True Color (32 bit), 60Hertz or 75Hertz
1024x768, 256 colors, 60Hertz
1024x768, High Color (16 bit), 60Hertz
1024x768, True Color (32 bit), 60Hertz

11 Additional Valid Modes for use only with 17" & 18" LCD Monitor
1280x1024, 256 colors, 60Hertz
1280x1024, High Color (16 bit), 60Hertz
1280x1024, True Color (32 bit), 60Hertz

In Your Desktop, Right Click -> Properties. In this Display Properties window, Click on Settings Tab.
Adjust the screen resolution to '1280 by 1024 pixels'.
Set Color Quality to 'Medium (16 bit)'
Then click on 'Advanced' Button. In Monitor Tab, Set the Screen Refresh rate to 60 Hertz. Click Apply/Ok in both the settings windows. This will Solve your Problem. Else, Try setting Color Quality to 'Highest (32 bit)'.

Are you referring to color scheme? If so, you should be able to right-click on an empty space on the computer desktop, choose Properties from the menu that appears. Then, in Windows XP, choose the Settings Tab. You should see a drop down menu on the lower right titled Color quality. In the drop down menu you can choose 16 bit, and should have a selection for 32 bit. Select the 32 bit, click Apply. Then the screen should change to that setting and ask if you want to keep those settings. Select OK and you should be good.

Right click the desktop, click "Properties", go to the "Settings" tab and under "Color quality" choose "Highest (32 bit)"

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Go to your desktop
Right-click choose properties
in the Settings tab, go to Color quality and choose 32 bit. then apply..click ok

1.try to change a screen resolution on your monitor. if did not solve your problem
2.change the colour quality either 32 bit or 16 bit

try your best.

please rate this solution whenever.

Sounds like your video card is failing. If you get video directly from the motherboard then you may need to replace it.

check the refresh rate, and other related adjustments