I thought I sent a message yesterday asking for additional help on this, but it doesn't appear to be here. Therefore, I'll try again.
After waiting 2 1/2 months, I finally decided to try this again. I have tried at least 100 times to get the red knob to go all the way around and only managed to get it to work about three different times. I could not figure out how in the world I did it, so I could not get it to go up the second time so I could reach the fan switch. Also, despite what one of the walkthroughs said, doing it counter-clockwise does not make it go up; it makes it go down. Therefore, I went up one level and then down.
I DO NOT touch the left button. I click the red knob, remove my finger from the mouse button, move the red knob to the left using the mouse only so I hear it click twice and then and only then click the mouse button. Other than the three times I managed somehow to get it to go all the way around, the only thing that happens is the bar goes over and down back and forth. I've come to hate that bar. It's supposed to only do that when I make it go through the slot. Trust me, I am not doing that; so why does it insist on doing it anyway. Grrrrrrrrrrrr!
I'm sorry. I give up. Can someone please send me a saved game just past this part. I totally and completely give up on this one. Believe me, I have read four different walkthroughs and cannot get it to work despite following all of the instructions.
Thanks so much for all of you trying to help me.