Chosen Solution

I spilt tea on my mac book pro, but was able to continue to use it with an auxiliary keyboard. However, I unfortunately turned it off and now the power button does not operate, this is where I originally spilt the tea.  Consequently, I have removed the optical drive from my mac as described by David Fear etc (so thanks to him and all those contributors) to access the connections on the power button, as described here MacBook Pro 13" Unibody Mid 2010 Keyboard Replacement The twin cable leading to the power button is 0.4 mm thick and about 2 mm wide, the plastic covering appears to be transparent, the “wires” inside are black and I assume could be carbon, thus they could be what may be described as nano cables, the photo shows the underside of the power button, the twin cable and a ruler for size

Can anyone advise me how to short circuit these cables to start the computer, could I use crocodile clips and or a probe to break through the covering and contact what appears to be the carbon “wires”?

Most of the MacBooks have power pads which which you can short across to turn on the system. Basically, they are just the same points the power switch are wired too. On your system they are located near the keyboard cable connection on the logic board

Lift the metal shield by unscrewing the two screws

Carefully short across the two pads, it only takes a second to kick the system to turn on. I would place your system in Target Disk Mode and then using either a FireWire or Thunderbolt cable connect your system to another Mac. Then you can directly copy off your systems stuff. If you have your new system you can use Migration Assistant so you don’t loose anything. If you can’t connect your two systems together get an external drive which you can make a TimeMachine backup, then use Migration Assistant to restore to your new system. Understanding the Applications for Target Disk ModeHow to move your content to a new Mac

Go for a spontaneous reboot. Unplug the battery and MagSafe. Press and hold the power button for 10 seconds. Reconnect the battery and MagSafe. This should cause a spontaneous reboot.