Admin panel not working on 2.2.5

[hpurehab]

We have a Macbook Air running the 10.14.4 OS that can log into the admin panel of our Magento 2.2.5 installation but once there can not do anything. The links in the left column don't work and the icons have changed to little square boxes. This happens in all browsers. 

We have a test site for our Magento installation and the admin panel does work on it but when logging into the live site the problem still exists. 

We've had the people at Apple try to find the issue on the Mac and we've had our developers try to see if the issue is with the Magento installation. Nobody has come up with any fixes.

As far as I know, there were no major changes to our Magento installation or the affected computer and until recently everything was working fine. I'm using the exact same computer and OS and mine is working fine. 

Any ideas would be appreciated.

Thanks,

[ankurkinex]

Do these steps

Remove pub/static
Remove var/cache
Remove var/composer_home
Remove var/generation
Remove var/page_cache
Remove var/view_preprocessed
run php bin/magento setup:static-content:deploy

it it doesn't work then open app/etc/di.xml file

Search

Magento\Framework\App\View\Asset\MaterializationStrategy\Symlink

and replace with

Magento\Framework\App\View\Asset\MaterializationStrategy\Copy

run php bin/magento setup:upgrade