I recently had a cd player put in my 2000 Honda Accord, my dash lights and tail lights no longer functioned. I found and replaced the fuse causing this. Now a day later I jump in the car turn on the AC and I got NO cold air. Could this be a result of pulling and checking the fuses in the under hood fuse box? It ran fine before and yes I had COLD air blowing prior to this. OR is this a freon problem. Is the HAC fuse the one for the AC? And what is the ACG fuse? Any help anyone can offer would be greatly appreciated.

Don't think so. With the engine running, and the AC on, check the sight glass for freon bubbles. If there are bubbles, add freon.

Use a test light or multimeter to test all under-dash and under-hood fuses.