what happened to my monitor?

I opened my PC with last know good configuration and colours are gone. It only has lowest (4 bit) and can't increase. How can i do that?Help...My monitor is Phillip...107S. By Brown Sugartry Safe mode
while opening in the last good known configuration it might hav uninstalled the driver for the video card so com,e to normal mode and try bootin again if u face the problem again u hav to reinstall the driver!