updated faq

docs/faq.md

@@ -8,6 +8,7 @@ This page contains answers to frequently asked questions about GaNDLF.
   - [Table of Contents](#table-of-contents)
     - [Why do I get the error `pkg_resources.DistributionNotFound: The 'GANDLF' distribution was not found`?](#why-do-i-get-the-error-pkg_resourcesdistributionnotfound-the-gandlf-distribution-was-not-found)
     - [Where do I start?](#where-do-i-start)
+    - [Why is GaNDLF not working?](#why-is-gandlf-not-working)
     - [Which parts of a GaNDLF configuration are customizable?](#which-parts-of-a-gandlf-configuration-are-customizable)
     - [Can I run GaNDLF on a high performance computing (HPC) cluster?](#can-i-run-gandlf-on-a-high-performance-computing-hpc-cluster)
     - [How can I track the per-epoch training performance?](#how-can-i-track-the-per-epoch-training-performance)
@@ -25,6 +26,12 @@ The [usage](https://cbica.github.io/GaNDLF/usage) guide is fairly comprehensive
 
 [Back To Top ↑](#table-of-contents)
 
+### Why is GaNDLF not working?
+
+Verify that [the installation](https://cbica.github.io/GaNDLF/setup) has been done correctly by running `python ./gandlf_verifyInstall` after activating the correct virtual environment. If you are still having issues, please feel free to [post a support request](https://github.com/CBICA/GaNDLF/issues/new?assignees=&labels=&template=--questions-help-support.md&title=), and we will do our best to address it ASAP.
+
+[Back To Top ↑](#table-of-contents)
+
 ### Which parts of a GaNDLF configuration are customizable?
 
 Virtually all of it! For more details, please see the [usage](https://cbica.github.io/GaNDLF/usage) guide and our extensive [samples](https://github.com/CBICA/GaNDLF/tree/master/samples). All available options are documented in the [config_all_options.yaml file](https://github.com/CBICA/GaNDLF/blob/master/samples/config_all_options.yaml).