Graphics problem with new monitor

hi there,i just started to have problems with my graphics when gaming,i also just set up a new 24inch asus monitor running DVI cable lastnight,when i run MW3 i am getting some graphics freeze,and on black ops i am getting flickering white objects and some objects are turning black also,when i was running my pc lastnight with the new monitor it was fine on MW3 and BF3,i will list the specs of my system and i hope someone can assist with some advice,thank you

core I5 2500k cpu
gtx560ti golden sample(gainward)graphics
4gig gskill ram
antec 650watt true power psu
coolermaster cm storm enforcer case
asrock pro3 motherboard

(good airflow and temps also)