2014 iMac Chime Black screen No startup PRAM Battery replacement - YouTube
NewerTech® : Batteries : PRAM Battery for PowerBook® G4 17-inch Aluminum 1.5GHz – 1.67GHz Systems
CMOS: What It Is and What It's For
How To Check and Replace Computer CMOS Battery? - YouTube
A reminder to remove the PRAM battery from your Mac, or replace it with a new one every few years to prevent this from happening. This was a Macintosh IIvx with its