Hi my monitor has bright colours on it and i cant

Turn off the pc but leave the monitor on. unhook the monitor from the pc. the screen SHOULD run a "self test" with a moving white green red blue box. if that box is on a bare black screen and there are no bright spots or cracks or anything weird looking, then the screen itself is ok. If however, you see odd shades of blue and pink and it looks cracked or scratched or has lines in it, then it is time to replace that screen.