occasionally on my laptop while playing a game or a movie my speakers will make a crackling noise, on game it will kick in half way through a level/map and will stop on the next level/map, during movies it will be there for a few minutes. i know that it is the sound card because ive plugged other speakers into it, the sound card uses the "Conexant AC-Link Audio" driver. the laptop is an hp ze4125 and i have the latest driver from hp's website. the speakers also make a long and constant humming noise when this happens. and according to pc wizard 2005, my "device audio" is "ali m5451 pci ac-link controller audio device"