Shut down your PC, switch off all power supply. Wait for one
minute.
Go behind the CPU, check that the cable connecting the monitor to
the CPU is connected properly. Make sure the thumb screws are
properly screwed in. After that, on again and see if it is still
pink in colour. If it is still pink in colour, you might have to
change whole motherboard if your graphics card is integrated with
the motherboard. If you don't want, it's ok, provided you can tahan
the pink colour.