Problems after reinstall

[rainlover]

I have a late 2009 iMac running OS X 10.11.6. I took a Mac update and it messed up everything.
Did a clean install using the original disks then updated back up to 10.11.6 but my machine is now running so sluggish. It was fine before this mess started. Now 2 out 5 times the screen freezes on the apple logo and I get all this text that is too fast to read? I have included some screen shots. I would be very thankful for any advice.

 

[TheSkywalker77]

Have you tried contacting Apple Support about it? Or googling it to see if anyone else has the issue.

 

[Sko]

It this an HDD? Maybe the update/reinstall triggered an about-to-die drive. Or some cache files went berserk, try deleting everything in /var/folders but NOT /zz (I know, some Voodoo involved).

Did you wipe the drive before reinstall? If not try that after a backup or use DiskWarrior to fix a damaged directory. Just the other day the MacBook Air from a customer refused to boot after closing and reopening the lid, just switching off half way through startup screen. His face when I asked about the latest backup (mid 2016 as we figured out later). DiskWarrior to the rescue - again, like dozens of times before.