you need a code to detonate the bomb on the door. you need a 4 digit number (you should have all the numbers you need from Goliath encounter and bomb collar). transmitter needs a battery, making a mobile energy detector will help fling the battery for the transmitter. (when you use the energy detector, moving your mouse over different objects on the screen will make the screen on energy detector light up when energy is detected)... hope that doesn't spoil too much.
Thanks Mac59! Got some sleep, read your hints and tried again...this time successfully:-) Now back to this great game...