No signal after installing AMD drivers

otman97

Reputable
Aug 28, 2014
31
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4,530
hey guys, i just bought a new pc, i5 2400, 4GB RAM, 1TB HDD, it's an HP Pavilion P7
i put my Sapphire Radeon HD 7750 on it, started, everything was okay
then i installed AMD catalyst
then i shut it down to put my other HDD
started the PC, i get no signal... then i removed my VGA cable from GPU and put it on MOBO vga output (without restarting pc) and it worked, the HDD worked, i saw the desktop, and a message saying that my GPU isn't supported by AMD catalyst (i think they are talking about intel HD, because my HD 7750 isn't on device manager)

what should i do?