pc boots but no display when i plug my graphics card

OK, so, it's been a half year since I have a nvidia gt 440 2gb ram and so on. And recently sometimes freezes my PC and I get a black screen(sometimes other colors), but that's not the problem, so I wanted to change my graphics card until I get a new one with an ATI Radeon Sapphire X1550 that I found, I know its old, but I don't have another one. OK, I removed my nvidia drivers completely with...



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