Has anyone experienced random wake/sleep cycles? (NOT random shut down)

Question

I bought my macbook on August 1, 2006, and previously had a problem with my it randomly shutting down. I had that fixed in December. Now I'm having the opposite problem, essentially. Whenever I put my computer to sleep, it wakes itself up, waits a few seconds, puts itself back to sleep, waits a few more seconds, wakes itself up... a constant annoying cycle. It doesn't matter if I put it to sleep by closing the lid or by choosing "sleep" from the apple menu, it still does this. I thought that perhaps one of my applications was causing my macbook to wake itself up, but this happens even when no applications are in use and I'm completely disconnected from the internet. This is driving me CRAZY because the noise of it waking itself up keeps me awake, and having to close out of all of my applications and shut down every night or whenever I want to transport it is terribly bothersome. Plus... the fact that it is waking itself from sleep can't be positive! Does anyone have any advice? I'm going to take it into the mac store but I'm super busy and wanted to see if anyone had any suggestions until then.
Thanks!
macbook   Mac OS X (10.4.8)  

Answer 1

I started having an almost identical problem. I would put the computer to sleep the screen would go black and seem to shutdown for a couple of seconds. Then the CD drive would make it's noise and the computer would wake up. I reproduced it with a clean install of OSX. If I had a password set on the computer and did not enter the password the computer would go to back to sleep and then repeat the process again and again.
The first day it happened I could reproduce it every time. Now it's not so constant. I need to get the CPU to around 140 degrees Fahrenheit for a few minutes and then put the computer to sleep by typing command-option-eject.
I suspect that there is a faulty cable or sensor. Conincidentally when the problem ocurred my bluetooth also seemed to "disappear" the computer could not detect the bluetooth module. That leads me to believe that there might be two cables one that is a case-open-close sensor and a bluetooth cable sensor and that they are getting pinched.
-Adam