I have Compaq Presario CQ5320F desktop pc. I had bought a new graphic card. It is ATI Radeon HD 4890. After installing the card on system I had connected the monitor. But there was no display. I through the cable was not proper. So bought a new one. But still the same issue. When I connect the monitor through VGA it works. But when I try to do the same by connecting my monitor on the gpu there is no display. I don't know to disable the vga port. How can I do that and set the pci as default.
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