I just bought a Aorus AMD Radeon RX580 graphics card and have plugged it in to my computer, I am sure i'm doing this correctly because I have watched several videos and gotten a new power supply that has the correct wattage. when I turn the computer on I see "no signal". I have tried installing new drivers and deleting the old ones and I tried to switch the HDMI for a different cord (DP). the only explanation I can think of is that its a old Lenovo computer and it is not compatible or that since I bought it second hand it could be broken or damaged. does any one know a fix?