Hi,
you should check two things first.
Make sure that the gold plated pins on the cards zorro connector are clean. If not, clean them best with some pure alcohol or sometimes an eraser can also be used for that.
Then make sure that the socketed chips are 'well' enough into the sockets. Just put some good presure onto them with your thumbs and don't be to afraid if you hear a cracking noise.
If that doesn't help there are other things to check.
Just come back to me then.
regs
Masta