Chosen Solution
I did not want to update to Sierra (Yosemite was running just fine) but Adobe Premiere refused to run without it. Now the laptop will not startup. At first, I had a progress bar on the loading screen that stalled and continued stealing overnight. Now, it keeps attempting to boot up but not getting far. Lots of code is on the screen. I’m not a programmer. Any idea what this means?
Edit: pressing shift to enter safe mode does nothing. When pressing option, this screen comes up. But clicking anywhere just brings my right back to code startup screen.
:(
First see if it will boot in Safe Mode by holding down the Shift key on boot. Boot up to the repair partition by holding down the Option key on start up. Go to Disk Utilities and see if the Disk can be repaired. Try booting again. If it fails do a reinstall from the repair partition.
