I had this card in an old pc and the display became very glitchy. I pulled it out and immediately saw that several 820uF 6.3V caps had blown. I replaced them (but not the other values yet as these look OK) but now the card isn't even recognised, I get one long beep and 3 short ones. I can't see anything wrong with my work. I would very much appreciate advice on how to troubleshoot this card as I've not done one before. If anyone has schematics or a service manual that would be great.

Hello from England. I'm a retired software engineer and enjoy repairing old computers.