Accidentally deleted /var folder, now recovery utilities not responding to trackpad/keyboard!

Apple support articles:

Startup Gray Screen

Startup Issues - Resolve

Since you obviously have access to another computer, maybe you can fix the problem using Target Disk Mode.

Target Disc Mode

I know it's late but maybe it will help other people.

I ran into the same issue and none of the solutions listed by apple helped.

I booted into single-user mode and I read the log in /Volumes/Macintosh\ HD/private/var/log/system.log, it was full of errors like theses

Dec 30 18:03:28 MacBook-Air locationd[352]: libcoreservices: _dirhelper: 454: mkdir: path=/var/folders/zz/zyxvpxvq6csfxvn_n00000sm00006d/C/ modes[2]=0700: No such file or directory

Dec 30 18:03:28 MacBook-Air.local locationd[352]: could not create persistent store directory (Input/output error)

Dec 30 18:03:28 MacBook-Air locationd[352]: libcoreservices: _dirhelper: 454: mkdir: path=/var/folders/zz/zyxvpxvq6csfxvn_n00000sm00006d/C/ modes[2]=0700: No such file or directory

The system actually tried to create directories in /var/folders but the directory /var/folders did not exists, so I created it:

Under single-user mode:

mount -o update /

cd /Volumes/Macintosh\ HD/

mkdir var/folders

mkdir var/folders/zz

reboot

And it booted just fine !

Colleague accidentally deleted a folder /var/folders...ludov04s post helped us to run under single user and find a permission issue ...then mounted the file system for update added the perms needed and voila worked like a charm ...thanks ludov04 !!!!

I had the same problem and tried your method, but it did not work.

Then I tried to delete the var/folders folder.

And the recreated the var/folders and var/folders/zz folders

This did the trick, and it worked.

Thanks for the help.