Please provide information about your computer, this includes is it a custom build or brand name such as Dell or HP, if it is provide the model name or series number (not serial) providing these details will enable us to better assist you.
Have you tried booting into safe mode to see if it is possibly a video driver issue
If safe mode will not work it could be a problem with your computers graphics card or integrated video chip, whichever you are presently using, have you checked the video cable for signs of damage including the pins in the end connections, is the cable secure (finger tighten only).
Once we have your computer details we can look at things for you to check..
My monitor will not display following a reboot after running system mechanic
These type of programs can render a computer useless by damaging the registry and so should be avoided, some further information http://miekiemoes.bl...weaking_13.html