So recently (about a week ago) I've been noticing this issue with my md-2010 17" MBP. For some reason, kernal_task seems to be spiking in CPU load. I never knew what this problem was...until I disconnected my TV I had plugged into it via mDP. So I tried it again and was able to replicate the issue, so for some reason up until recently, kernal_tasks spikes in CPU (thus, causing the fans to blare) whenever I connect my TV to my MBP via mDP-to-DVI. It's never done this before. Here's a screencap when watching a film using VLC on my TV connected to my MBP via mDP: As soon as I disconnect, it returns to normal. I can't force it to quit & a reboot was no avail. Any solutions or what could be causing this? I am running Snow Leopard (10.6.8).