edited for more detail information (turbocad6) I will see if i got pics and make a spoonfed how to for all the laptops i get.
WORKSDell Latitude D600- The cover on the laptop where the power button is just pops off with a small screwdriver.
You can solder it to the power button.
WORKSdell D600 docking station- Disassemble the docking station to solder to the docking station power button.
Does the same thing except it will make it easier to remove the laptop in/out of the car.
WORKSHP 530 laptop- Top section of laptop where power button is removes when (6) screws are removed.
Solder the wires to the power button.
WORKSIBM A31- ONLY with a docking station because the IBM A31 has a ribbon power button.