Wiings

yo guys,i was using using display port cable for my pc for past 6 months to get 144hz and it was working perfectly alryt.and after a update my cpu froze and i restarted my pc suddenly my monitor is capped @60 hz in display port i tried everything its not helping please anyone help me i tried my hdmi cable it shows 120 hz but all my game is capped 30 fps and the display port gives no signal sometimes. there is no option above than 60 hz in advanced display settings and nvidea control panel also