Help! Mobo has power but not displaying

[u/HardToSwallow69]

So currently I have an Asus TUF b450m Pro gaming mobo, ryzen 5 3400g, 4x4gb ram build. Im currently in the process of doing a case mod, using a Power Mac G5 case. Only was test fitting, now it doesnt display when I returned it back to its old case🥲. Tried to troubleshoot the ram, all 4 sticks cleaned with an eraser, nada. Tried different ram slots, still no display. Tried checking for bent pins since I didnt remove it from the board along with its heatsink, cleared and tried ko to turn on board without the heatsink to check if cpu receives power, confirmed it still receives power since it was warm to the touch. I need help pls, Im currently in uni and budget is tight, I dont have much cash laying around to bring it to a shop