I just installed a new sink/faucet today after taking the old one out. The old one drained fine as recently as this morning. The only part of the plumbing that I have exchanged is the pop-up tube and plunger. The rest of the tubing under the sink is the same. After I hooked it all up and ran the water, it would no longer drain. Any ideas? By the way, it says that I answered my own question, and that is not the case.