my mobo is Ga 890 gpa ud3h version 2.1
psu 300 works well
video card is 4290 built in works fine
monitor syncmaster 1930b .. works well with at 1920 1080 through hdmi cable converter
when i try to install hd 5450 or 6770 graphic card sometimes... driver will install correctly but it makes my screen resolution stuck at 1366 768 the 1920 1080 is still available but when i check it monitor goes off and i had to restart pc
and sometimes when i try to install the driver for 5450 or 6770 it comes to installing the display driver the screen goes black and i hear like a restart but nothing happenes...... any fix for this problem?