If your HP dv6000, dv9000, or Compaq F700 has these symptoms:
– Devilish buzzing from the speakers at all times, even in the BIOS or during startup, in tune with the CPU fan speed
– Push power button, and it turns on for a few seconds then turns right back off… push it again, turns on, turns off… mash it again, on and off… and that’s all it does?
That cable powers the speakers (hence the buzzing sound), and if it’s unplugged from a working & running system, the system shuts off. There ya go. It turns on because it gets a signal from the button, but turns off likely because the lid switch wires are broken in the cable (hence it thinks the lid is closed, hence it shuts off). That’s just my theory, but still, pretty reliable fix since I just resurrected a dead motherboard with that theory.