i recently recieve a set of Logitec z560's with its pretty big 8" subwoofer. It was about 3 and a half feet away from the computer, both under my desk. I used the new system for about 5 hours and then the computer suddenly turned off. Now it wont post no matter what i do. Any ideas as to what could have happened, could the subwoofer's magnetic field have f!@# it up? Any contributions would be appriciated. Thanks.