I can't find the circuit board that's supposed to be by the monitor under the cabinet that has the silicon wafers. Help!

Is this the part of the game you are asking about? Or is it somewhere else in the game?

I remember very little about this game as it was many years ago that I played it.

There's something I apparently need to do because Ryan isn't available. She's supposed to be fixing the device that Nancy can use to watch, hear?, the video that she got. That's where I am.
I'm trying to follow the walkthrough but something's not right. It ways I'm supposed to find the cat leg in the photolithography lab under the cabinet that has the silicon wafers. And a circuit board to the right of that cabinet. Nothing.

I hate to suggest it, but have you read the walkthrough step by step to see what it is you might have missed? It's so hard for anyone else to know or guess!

Yup. Several times. I'll try again.

I do remember that there is a sequence to some of these things, where if you have omitted a step the next thing does not happen. I will post if I have any other suggestions.

I assume you have looked at the task list and also the available hints? If you aren't playing Master Sleuth, that is.