How did you guess? That may be it, actually. We have about three Gateways at work, and they cause more trouble than the rest combined, seems like. Should add something about it to their slogan. "Gateway - the computer that comes with it's very own gremlin! Watch out - he bites!"
I got rid of it and got an Alienware(Expensive, but among the best in quality and support). One problem with the speakers in nearly 3 years. I sent an email. They sent new speakers after one question back that I answered.
No other problems at all and no complaints.