Could any of you D300 owners help me? It's probably me being silly but when I set my white balance to Pre-manual setting,(wait for Pre to flash, take shot,make sure "good" in viewfinder) I'm getting a blue/green cast!

My printer is Grey in colour if I point to the printer to set pre manual to Grey the shots seem to be a lot brighter Is this right? I have tried with and without flash and still the same! I will post some shots later.