I'm having a problem getting to Channelwood. I have opened the safe & gotten the match, but cannot get the boiler to light. I have the 10th anniversary DVD edition, using Windows XP. I seem to remember a gas valve of some sort from when I played the original Myst years ago on an older computer, but cannot find a gas valve anywhere on the boiler here. The only valve I find in the room is the big one on the wall by the boiler.