Need assistance for a friend

(basic specs below)

Mobo:z890-p Wifi CPU:ultra 7 265k Gpu:Radeon Rx560 (Radeon Rx 9060xt once this issue is solved)

So my friend built a pc He didn’t have quite enough for a Gpu so he was using a GTX960 which died he then changed to a Rx560 until a few days ago when he bought a Rx 9060 xt he’s installed the Gpu in but gets no signal at all not even while using integrated graphics it’s like his whole pc looses power.

Once he takes it out and Installs old Gpu back in back picks up the old one posts n he can use it like nothing ever happened

Does anyone have any ideas like dead Gpu compatibility issues even I’d try and have a look but me n the home boy live on other sides of the country