I was wondering if you could help with a Klipsch Promedia 5.1 Ultra. It works for a few hours, then audio drops out and a high pitched noise comes from the speakers. If I unplug it for a while it goes back to normal. I've read overheating is common, so I'd like to buy one of your cooling kits. If this sounds familiar and you can give me insight on other parts that may be bad, any help would be appreciated! Thanks!