please help when i switch user on my pc it keeps saying SIGNAL OVER RANGE why is this is has just done it since i got a new screen how can i put this right.

Does this only happen with particular User Accounts? Do any Users work properly?

It sounds like your display drivers have been set to a resolution and
refresh rate combination that your monitor does not support.


The first thing to try is booting in safe mode (repeatedly press the F8 key
before Windows starts to boot).


Set the display to 800X600 at 60 Hz. (Display control panel, Settings
button.)


Reboot into regular Windows.


You may need to install the .inf file for your monitor if XP doesn't
automatically do so. That will provide settings that will only allow you to
choose supported resolutions and refresh rates.