Hey guys I have a 20 inch imac (mid 2007) that i start having issues with. while watching videos with silverlight or flash i notice that the CPU usage will go up to 100 percent of system utilization within 15 seconds of starting the videos. the sites were hulu, netflix, and youtube. However i switched over to HTML 5 on youtube and now those videos play perfectly with no usage increases. i've uninstalled both flash and silverlight and reinstalled them and get the same result. Any advise?