Have just purchased an ex display ipad 4 and trying to reset to factory settings

1. Plug iPad into the computer with the USB cable. The iTunes on your computer will automatically launch. If not, double-click the icon to start it.

2. Click the name of your iPad at the upper right corner of iTunes, and then the information of your iPad will be shown. Click the "Restore iPad" button in the window to start.

3. iTunes will ask whether you want to back up iPad before restoring. You'd better choose "Yes" for the reset will erase the contents in your device. Then iTunes will start restoring your iPad to factory settings.

4. Click Restore again to confirm. Then iTunes erases your iPad and installs the latest iOS software. After you restore your iPad to factory settings, it will restart. Now you can set it up as new.

http://www.leawo.org/tutorial/how-to-restore-iphone-6-plus-to-factory-settings.html

iTunes enables you to restore iPad to factory settings. Before you start restoring iPad to factory settings, please note that you need to install the latest version of iTunes on your computer. Then go to Settings > iCloud to turn off Find My iPhone. Now, you can factory reset your iPad with iTunes as follows.

1. Plug iPad into the computer with the USB cable. The iTunes on your computer will automatically launch. If not, double-click the icon to start it.

2. Click the name of your iPad at the upper right corner of iTunes, and then the information of your iPad will be shown. Click the "Restore iPad" button in the window to start.

3. iTunes will ask whether you want to back up iPad before restoring. You'd better choose "Yes" for the reset will erase the contents in your iPad. Then iTunes will start restoring your iPad to factory settings.

4. Click Restore again to confirm. Then iTunes erases your iPad and installs the latest iOS software. After you restore tablet to factory settings, it will restart. Now you can set it up as new.

How to Restore iPhone 6 Plus to Factory Settings

iTunes enables you to restore iPad to factory settings. Before restoring, please note that you need to install the latest version of iTunes on your PC or MAC. Then go to Settings > iCloud to turn off Find My iPhone. Now, you can factory reset your iPad with iTunes as follows.

1. Plug iPad into the computer with the USB cable. The iTunes on your computer will automatically launch. If not, double-click the icon to start it.
2. Click the name of your iPad at the upper right corner of iTunes, and then the information of your iPad will be shown. Click the "Restore iPhone" button in the window to start.
3. iTunes will ask whether you want to back up iPad before restoring. You'd better choose "Yes" for the reset will erase the contents in your iPad. Then iTunes will start restoring your tablet to factory settings.
4. Click Restore again to confirm. Then iTunes erases your iPad and installs the latest iOS software. After you restore your iPad to factory settings, it will restart. Now you can set it up as new.

http://www.leawo.org/tutorial/how-to-restore-iphone-6-plus-to-factory-settings.html

iTunes enables you to restore iPad to factory settings. Before you start restoring iPad to factory settings, please note that you need to install the latest version of iTunes on your PC or MAC. Then go to Settings > iCloud to turn off Find My iPhone. Now, you can factory reset your iPad with iTunes as follows.

1. Plug iPad into the computer with the USB cable. The iTunes on your computer will automatically launch. If not, double-click the icon to start it.
2. Click the name of your iPad at the upper right corner of iTunes, and then the information of your iPad will be shown. Click the "Restore iPhone" button in the window to start.
3. iTunes will ask whether you want to back up iPad before restoring. You'd better choose "Yes" for the reset will erase the contents in your iPad. Then iTunes will start restoring your iPad to factory settings.
4. Click Restore again to confirm. Then iTunes erases your iPad and installs the latest iOS software. After you restore your iPad to factory settings, it will restart. Now you can set it up as new.

How to Restore iPhone 6 Plus to Factory Settings

iTunes enables you to restore iPad mini to factory settings. Before you start restoring iPad to factory settings, please note that you need to install the latest version of iTunes on your Windows computer or MAC. Then go to Settings > iCloud to turn off Find My iPhone. Now, you can factory reset your iPad with iTunes as follows.

1. Plug iPad into the computer with the USB cable. The iTunes on your computer will automatically launch. If not, double-click the icon to start it.
2. Click the name of your iPad at the upper right corner of iTunes, and then the information of your iPad will be shown. Click the "Restore iPhone" button in the window to start.
3. iTunes will ask whether you want to back up iPad before restoring. You'd better choose "Yes" for the reset will erase the contents in your iPad. Then iTunes will start restoring your tablet to factory settings.
4. Click Restore again to confirm. Then iTunes erases your iPad and installs the latest iOS software. After you restore your device to factory settings, it will restart. Now you can set it up as new.

http://www.leawo.org/tutorial/how-to-restore-iphone-6-plus-to-factory-settings.html

Barry, You may have to do a factory reset and start over, or contact manufacturer for suggestion.
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When you get into "settings" you have to scroll down to the last option which will be "reset"

Make a new back-up of your ipad, do a factory reset and then restore from the back-up.

The two most common reasons for resetting an iPad to the factory default settings are to prepare the iPad up for a new owner or to overcome a problem with the iPad that simply rebooting the iPad won't solve.

settings -> general -> reset

you need to connect your iPad to your computer and open iTunes software - there the iPad will show up and you can do a reset.
without a computer you cannot reset an ipad... Use iTunes to restore your iOS device to factory settings

Factory reset the iPad, you will lose all of the data on it though. In theory, you should be able to connect it to a computer first and do a backup in iTunes but this will depend on the security settings on the iPad. Regardless, your purchases should be linked to the iTunes account that was being used so after a factory reset you should be able to reload your purchases.