[sdelsolray]

Search the DCU for CHUD. It's a package of software development tools for OS X.x.x, one of the tools allows you to turn off the CPU "napping" feature. This is where the CPU, although not going to sleep, "naps" on certain cycles. The Mac always boots with napping turned on. You want to turn it off via this Apple developer tool (which istalls itself into a pane in the System Preference application). The tools come with your OS X CD.

Try it, it might solve your problem.

BTW, with napping turned off, your CPU will run a bit hotter. Also, you have to turn napping off everytime you start you Mac if you are going to record.