Hard drive wiped need to reset factory setting on Mac OS 10.11.6

Hi Hallandalegirl,

You will need to reinstall OS X (macOS) after you wipe your hard drive.

1. Start up from OS X Recovery: Press and hold Command-R as you power on your Mac. Release the keys when the Apple logo and a progress bar appear.
2. When the Utilities menu appears, select Disk Utility and click Continue.
3. Select View -> Show All Devices.
4. Select the top level of the internal drive and click Erase. Choose these options, then click Erase:
   1. Name: Macintosh HD
   2. Format: OS X Extended (Journaled)
   3. Scheme: GUID Partition Table
5. When the erase is finished, quit Disk Utility, select Install OS X, and follow the onscreen instructions. You'll need a good Internet connection.

Trust this method was used - How to erase an Intel-based Mac and if so How to reinstall macOS