my computer failed on opening

Like the settings for your monitor are incorrect. You may need to boot into Safe mode and correct these settings.

http://www.mydigitallife.info/2008/06/22/how-to-change-screen-resolution-and-display-colors-quality-in-safe-mode-of-windows/

Above is a step by step guide on how to do this.

Thanks,

Do as suggested above to reset your Display Resolutions. If you are unable to understand the directions post back and we'll see what we can do to help you further.

Col

it is your graphics card or graphics chip, that is if it is a onbord graphics card if you are using
a nvidia or ATI graphics card then you have got the
hertz for your graphics to high so your moniter is not able to run at that range

to sort this unplug the graphics card and turn on the pc for 5 mins then turn the pc off and put the graphics card back in then turn on the pc and that should fix the problem ...
if it a onbord graphics card just reset the bios and that should fix it if not then it may be a biget problem ...