Problem solved. I replaced the original trackpad and battery in preparation to send it to Apple for a depot repair, On plugging the battery in it booted. Black screen with the shite Apple and white progress bar. As it booted a small white progress bar in the lower left hand corner went through a run. Mu guess is the EFI Trackpad update finally kicked in. Any way the track pad works fine now. Booted from an external hard drive that I had backed up the 10.11 system and original data on and the machine runs fine. Am I correct? Was that small progress bar in the corner a hardware update?
+
Problem solved. I replaced the original trackpad and battery in preparation to send it to Apple for a depot repair, On plugging the battery in it booted. Black screen with the white Apple and white progress bar. As it booted a small white progress bar in the lower left hand corner went through a run. My guess is the EFI Trackpad update finally kicked in. Any way the track pad works fine now. Booted from an external hard drive that I had backed up the 10.11 system and original data on and the machine runs fine. Am I correct? Was that small progress bar in the corner a hardware update?
Problem solved. I replaced the original trackpad and battery in preparation to send it to Apple for a depot repair, On plugging the battery in it booted. Black screen with the shite Apple and white progress bar. As it booted a small white progress bar in the lower left hand corner went through a run. Mu guess is the EFI Trackpad update finally kicked in. Any way the track pad works fine now. Booted from an external hard drive that I had backed up the 10.11 system and original data on and the machine runs fine. Am I correct? Was that small progress bar in the corner a hardware update?