Try it with no other cards installed. Triple-check your jumper settings based on BBOAH and amiga.resource.cx. Make sure your card slot and edge connector are nice and clean, and seating correctly, and not affected by any battery damage.
Beyond that, as said above, it should "just work". Try card in a different Amiga if possible, and try a different card in that same Amiga, should help you narrow down whether it's the motherboard or the card. I'd be a bit wary of the GVP install disk since sometimes they can install some outdated and dodgy software. I'd especially avoid any of the GVP disk prep stuff. Check Ralph Babel's archive and the GVP-M website to see if there's any updates.
Good luck!