replaced both RAM chips. upgraded to Yosemite, now no firefwire bus
After increasing the RAM to 6 GB. One 4 GB and one 2 GB modules. I then upgraded my OS from Mavericks to Yosemite. Now none of my firewire hard drives are loading, and the system profiler says firewire devices cannot be listed. I have reset the NVRAM and this did not help.
Is this a good question?