737-800 Problem

Hello,I have been operating all of the 737NG models since they came out without any problems until now. Today, I loaded the 737-800 and the following occurred:- Radios will not work, even when APU is on;- Radio controls won't work at all, I can't change freqs;- The duct pressure always shows zero even when the APU is running and APU bleed is on;- Despite this, I managed to start the engines and bring the generators online, however the duct pressure still showed zero regardless of the bleed settings and the radios still won't work.I closed FS2004 and restarted clean but still the same thing happened. Any ideas?Jim