Installed new RAM, PowerMac G5 Quad RAM Fix (fans on full blast, won’t boot)
The symptoms are generally the same. The machine starts to boot, the screen stays black, and the fans come on full blast. Last night I experienced this again.
Symptoms: Something a little odd on the first boot after adding the RAM. Before going to the gray Apple screen, you get the little “folder with a question mark” briefly, then on to the gray Apple screen. It seemed like it was recognizing the new RAM, then going on and booting up.
Answer: Reset the NVRAM (non volitile RAM).
Note: be sure to have all of your RAM installed before you do this.
Here is how to do it:
To boot into Open Firmware, shut down your Mac, then start it up while holding down the Command, Option, O and F keys. At the prompt, enter the following commands (you may want to write them down on a piece of paper before beginning this process), pressing the return key after each:
After which your Mac will restart.
After doing this, the Mac will start right up. No “folder with a question mark”, no tornado effect from the fans, just a happy boot.
UPDATE: Another tip: Unplug FireWire devices before running security updates, etc.