The power button on my XPS 8930 has failed and I want to replace it. As far as I can determine, what I need is a power button module. But all I have been able to find is the power button cable, P/N 37JGH, O37JGH, CN-37JGH. If I just replace the cable, will that solve my problem? If not, what compromises a power button module (a picture would help), what is its P/N and where can I get one?