Sleeping with the lid open

This is so basic, I am embarrassed to post, but here goes. I have a MacBook that sleeps just fine with the lid closed. Light pulses, spin up noise when I open the lid. Recently I have noticed that when I leave the lid open, the screen goes black in the appointed time (from setting in System Preferences), but the little light on the front does not pulse nor do I get the spin-up sound when I move the mouse, etc.
Now for the embarrassing part -- has it always worked this way, or is this something new? I feel sure that previously I could leave the lid open and after the appropriate time, the light would pulse, etc. But not now.
I have reset the PMU several times, checked the sleep preferences, made sure that there was nothing running, no bluetooth activity, etc. But no joy. I called Apple, and the tech there (who quite frankly was hard to understand, but I think I did understand him enough) told me that the behavior I am experiencing is correct. What I want to know is whether the MB sleeps with its lid open and no pulsing light (just on steady). Is my machine sleeping or not?
Thanks in advance!

Thanks for your replies! I have checked my settings repeatedly -- currently (for testing purposes) set for the screen to sleep after 2 minutes, the hard drive to sleep after 2 minutes, hard drive to sleep when possible, etc. Bluetooth is not the problem, set to not wake for bluetooth activity, as is the "wake for ethernet". I have even restarted the computer, left it at the login page, and the behavior remains (no pulsing, no spin-up sound). Now that I think about it, when I close the lid for sleep, the light pulses, but no spin-up sound. Hmmm, should I be worried?
Just seems to me that with my G4 PowerBook and this MB earlier, that with the lid open the light would pulse, and just a while ago started not pulsing. Seems about the time I did a software update, but can't be sure. This issue is somewhat important to me because I use WireTap Pro to schedule recording of a couple of radio shows, and need to leave the lid open so WTP can "wake" it to record.

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