Corrosion is a persistent problem in machine of this vintage.
I'd start by pulling all the RAM, giving the sockets a good dusting with some compressed air, and then reseating the RAM. It doesn't hurt take in and out a few times-working the sockets can help clear up corrosion.
The same thing goes for the PCI card-I'd suggest pulling and reseating a few times, or even try a different socket.
Finally, it doesn't hurt to run something like TechTools and have it check your RAM. Even though it's all(presumably) new, you're still not guaranteed that all is good. A single bad stick can throw things off. When diagnosing RAM problems, it's often helpful to force the computer to disable interleaving by removing everything from one of the RAM banks. In the worst case, test the sticks one by one. OS 9 likes a little more than 128mb of RAM, but it will run fine on that for testing purposes.
I'd start by pulling all the RAM, giving the sockets a good dusting with some compressed air, and then reseating the RAM. It doesn't hurt take in and out a few times-working the sockets can help clear up corrosion.
The same thing goes for the PCI card-I'd suggest pulling and reseating a few times, or even try a different socket.
Finally, it doesn't hurt to run something like TechTools and have it check your RAM. Even though it's all(presumably) new, you're still not guaranteed that all is good. A single bad stick can throw things off. When diagnosing RAM problems, it's often helpful to force the computer to disable interleaving by removing everything from one of the RAM banks. In the worst case, test the sticks one by one. OS 9 likes a little more than 128mb of RAM, but it will run fine on that for testing purposes.