MacBook Power Pad Location

Hi am using my A1278 typing this reply! Anyways, i have this prob recently too. Was trying to fix my wifi mod, which failed after upgrading to lion and disconnected my keyboard flex cable alot. (i had other issues like failed usb etc thus needed to take the board apart to verify stuffs). In the end, the flex cable connections got worn off and i could not power on my mac. Shorting pin 5 and 6 worked for me but its not a perm solution (considering you have to open the bottom case, identifying the pin, short it and put it back again :P) Thus i highly recommend you to purchase a new keyboard with power button. You can look for it on ebay, i paid around $16USD for a second hand keyboard and now its working fine!! :) Hope it helps... i had a hard time trying to 'fix' this problem thinking it was something else that failed; only to find out it was the flex cable fault. One tip, apply adhesive tape on the flex cable to enable you to put in or pull out the cable with ease! (trust me, i learnt it the hard way)... Also, to replace the keyboard, you will need to remove a ###* lot of screws! You can find steps here:

MacBook Unibody Model A1278 Upper Case Replacement

to anyone needing to find power pads on macbooks etc, here is a recent link I found that has good service manuals which show power pads and motherboard information such as this....

these manuals also show the liquid indicator locations

ifix.me