I've had this happen maybe four times in the last year so far so it's not a frequent issue but it does have my attention. I'll be using my computer and all of a sudden the trackpad becomes unresponsive as though the computer has hard frozen. The keyboard also is not responsive. But the clock continues to show the seconds elapse. The caps lock light won't turn on either.
I got out a usb mouse and plugged it in and it works fine. System profiler still sees the top case under the usb bus. Nothing i tried would wake them up short of what I knew would do it - put the computer to sleep and wake it up. As expected, the trackpad and keyboard resumed working.
I checked the console, system, and all logs in Console and found nothing that indicated a problem or resolution.
So is this an issue anyone else has seen? This is the last pre-unibody mbp, running 10.5.8.
