I have a MacBook Mid-2009 2.1 GHz. I've tried booting (with power adapter connected) from the internal and a bootable...

I maintain 120 Macs & have had very few kernel panics over the years. Over the past few months, I now have a dozen iBooks...

I've left it totally disconnected for days, reset the SMC following Apple's directions (listed at bottom of this post),...

School computer for student use was brought to me with complaint: running on battery-only, unexpectedly powered down. I...

It's a bit early to say, but I think I've been bitten by the "Dual-band Airport causes kernel panic" issue described in this Apple Discussion post many months ago. It's actually a Tiger bug. I guess it says something about my search skills that I spent MANY hours looking for a fix, and only after reluctantly coming to the conclusion that I was going to have to jettison nearly two dozen iBooks did I stumble upon the above link by accident. It's only been hours, not days or weeks, since I applied this fix, but a couple of machines - that KP'd almost on startup - are still running. If my enthusiasm for this fix is dampened by reality, I'll post here again.