I have a 2012 13" MacBook Pro (non retina). The power button is not working. Other then that the system was working fine. I tried to fix the power button by opening the back cover, disconnecting the battery, followed by removing and reattaching the keyboard wire. After I connected the battery and booted the system by connecting the MagSafe connector, the system booted really slow (I have an SSD, and it usually takes ~10 seconds but it took 3 mins) and the fans were at full speed.

The system became really slow and apps launched really slowly. I check the Activity Monitor and CPU was idle. So I figured out that I need to reset the SMC. But I don't know how to do it, as the power button is not working. I tried resetting with smcflasher.efi (from the smcupdate.pkg) by booting to rEFIt. It says the reset option is unavailable and figured it out that Apple locked down resetting/modifying firmware externally.

Is there any other method to reset SMC?