Why does the monitor not turn on after replacing the video card, what should I do?

Question

Video cards

Hello ,
I bought a radeon 6930 gaming video card
, now it has a built-in geforce 6100, when I insert the radeon into the motherboard, everything turns on, but does not show the monitor.
I've been looking for a problem on the internet for 2 days already,
they say that you need to cut down a custom video card from the BIOS (if so, tell me how to cut it down on bios amd phoenix),
please give an answer who has already had such an error.
motherboard MCP61M2MA
PSU 600WT

Answer 1

Have you connected additional power to the video card?