El Capitan install freezes
Just bought a Mac Mini A1283 (late 2009) with 8Gb ram and a new 500Gb HD. Lion 10.7.5 is on it and works like a champ. I want to upgrade to El Capitan which will run on this mini.
I made an El Capitan install USB stick (following instructions on the Apple support site) and booted up, but after about 40 minutes the progress bar stops at 99%. I let it sit for 48hrs with no change. Force restart and the progress bar restarts and makes progress to 99% then stops.
I've tried everything I could find in various forums - reset NVRAM, reset SMC, erased and reformatted the HD (passes first aid), replaced the battery, reset the date and time, tried a clean boot to a Yosemite USB (same result). I also tried to upgrade from Lion via the app store, both with Yosemite and El Capitan with the same result (stopped at 99%).
A clean boot from a Lion USB installer works every time, but the newer systems do not. I'm sure it is a simple authentication or certificate or verification issue at the end of the install, but this has me stumped. Anyone have some insight??
Is this a good question?