Question No signal after replacing graphics card...

Dec 9, 2019
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Hello, I need some serious help I’m baffled I’ve looked up what I can and tried everything I’ve found.
I received a pc as a gift from my brother in law, he got a new pc and took his graphics card out of the one he gifted me and put in the one from the pc he bought, when i brought the pc home I plug it all in and booted it up but I’m getting no signal on my monitor I’ve tested the monitor with a laptop and an Xbox and it seems fine with them, all leds are on and I can hear the hard drive spinning and my fans are coming on the motherboard.
Any help would be much appreciated thank you, and I’m sorry if I posted this in the wrong section.