Hello! I've got a Macbook Pro 13' mid 2010. The battery had run out (just 2h of battery time on 100% charge) so i bought a new one on Ebay. battery link: http://www.ebay.com/itm/New-Original-Genuine-Apple-MacBook-Pro-13-A1278-Akku-A1322-661-5229-Battery-/121392086528?pt=Laptop_Batteries&hash=item1c43883e00 Then i followed these instructions from ifixit for the installation of the battery. https://www.ifixit.com/Guide/MacBook+Pro+13-Inch+Unibody+Mid+2010+Battery+Replacement/4300 Now to the problem: When I started the computer it seems like it can't find the new battery. The battery symbol looks like a battery with an x in it. [ x ]- If i unplug the power cord the computer dies. What I've done so far is to reset the SMC on the computer by turning it of, push the left shift + ctrl + option button at the same time and then start the computer again. It didn't seem to help. Now. What can I do?