I have a MacBook Pro mid 2009 2.26 Ghz and I took the battery A1278. I followed correctly all the instrctions and I used your tools, but now my laptop cannot switch on... It seems that the energy doesn't go from the battery to the computer. I tried to replace the old battery and the conclusion is the same as with the new one! So now I cannot switch on my laptop with any of the two batteries.
What do I have to do? Why did this thing happen?
Thank you