my pc screen keeps going blue tinted

check the cable first. a blue or cyan cast that comes and goes is really often a loose connection, one of the colour signals drops out (red, usually) and everything goes blue. push both ends in firmly, and if it's VGA look for a bent pin. if you have a spare HDMI or DisplayPort cable, swap it and see if it ever comes back. if the cable checks out, reset the monitor to factory settings from its own buttons, in case a colour preset got changed. then look in the NVIDIA or AMD control panel for any colour adjustments, and try switching HDR off in Windows display settings. a driver update can be worth a go too.