Thank you. You have nailed my problem. I ordered a 37JGH from an amazon seller and it came without the button. The only one I could find with the button was used from the ebay seller. I do not know whether I should replace just the cable or the entire module. To be safe, I want to install  the entire module. My problem has been that pushing the button does not start the computer; I get a 3-2 amber pattern instead, which I know supposedly means there is a memory problem. However, the computer will start if the only thing plugged in is power. Further, it will restart fine from the power menu in the start menu. Further, I have done much testing (including Dell;s on-line tests) and cannot find any problems. Thus, I think the problem is the power button. From your information, it seems the best thing to do, would be to return the part I have and purchase the one from the e-bay seller. Let me know if you have any thoughts.  Thanks again.
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?
XPS 8930, power button module