I have a pcg5 mx1333 motherboard and I had a nvidia 210 which worked fine. So I borrowed a sapphire HD 5450 2gb version from my friend and replaced my 210 with it...and installed amd's 14.4 display drivers, after installation it asked me for restart and I pressed yes after that a black screen . I am on windows 8.1 x64 bit..and I can't go into safe mode.