3 Ram Slots not working after 5,1 upgrade and processor installMar 31, 2018 Maybe you can help. I did this upgrade on MacPro 4, 1-Did the firmware upgrade to 5,1. Completed the hardware in...
Fan runs as soon as power is plugged in.As soon as the computer is plugged in to power source the fan runs at high speed. Power button does not need to be pressed. D...
installing new video cardI installed the ATIRadeon x1900 card (512MB) in my 2006 Mac Pro. Can't change resolution- its at 1200x800 on my 30 in cinema ...
Answer to "3 Ram Slots not working after 5,1 upgrade and processor install"The EFI update went fine. Did the SIP disable in El Capitan in a Mac Pro 4,1- Result 5,1. Fine. Figured out the cause. One of the very, very tiny pins for some reason got bent on the periphery of the center of the CPU (on the processor tray). I was very careful- So I can not for the life of me figure out how this happened. After attempting to straighten the pin and booting up I got only 1 RAM slot not working. 3 is much better than 1 working. I took it apart about 4 times and I got the same result. They are very fragile and so small- I needed a jeweler's loupe to do the job. I didn't want to chance it another time. It being a back up Mac Pro- I'm accepting this problem. Bought more RAM - so I making up for the lost slot. Thanks for your answer.