How do i restore my asus b121 to factory settings

First, try rebooting. If that doesn't fix it you may consider restoring the device to the original factory settings. A word of warning...restoring to factory settings will take the tablet back to the way it was when originally purchased. All passwords, updates, music, photos, videos, audio recordings, apps and so on added after it was purchased will be deleted. So don't do this if you are concerned about losing the aforementioned data and files. To do a factory reset go to settings and look for a restore option. It may be under something like system restore, device settings, back up and restore or something similar. Once you find it, it should warn you that your device will be restored to factory settings and that all post factory apps, passwords, data and files will be deleted. If you still want to restore your device follow the instructions. You will then have to set everything up from scratch as if it was just purchased. I did this with a Kindle Fire. After the factory restore I reinstalled my apps, added all my accounts (email and so on), downloaded all my books, music, etcetera, and it has worked great since.

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

You don't state which ASUS product you own, but most (if not, all) ASUS tablets don't have a button to reset the device. You can do a factory reset via the settings menu. Look for a 'Backup an Reset' entry.

http://www.asus.com/uk/support/self-service/2/

Ah ASUS. I have a Memo 10. Had the same problem when it was 6 days new. Asus has a UI that is bad.

1. First try to charge via USB to your computer. If you get any result good, leave it a bit.

2. Leave it plugged in and see if it will turn on. If you can get it to turn on ... do this.

3. Find the back up and restore/factory reset. Back up your data, pics, music. etc.

4. Do a factory reset... it will say everything of yours will be delted. Proceed.

5. Restart the tablet.

6. Go into settings and TURN OFF Asus's UI. On my Memo 10, under settings is a menu called "Asus Customized settings" in the sub-menu turn OFF "Use ASUS Quick Setting" yours may say something a bit different.

7. Restart. The look will be different but no worries. On the upper right see if your tablet it charging. It will be a battery with green and black and a lightening bolt in it. If it is charging try your wall wart charger.

Good luck!

Follow the guide on Asus' site http://support.asus.com/Troubleshooting/detail.aspx?SLanguage=en&p=3&m=R2H&s=84&hashedid=AYgvN10WR0fczlpn&os&no=1775

http://smallbusiness.chron.com/restore-asus-laptop-factory-settings-53444.html

check see if you followed the steps outlined in link above

maybe you could do a windows 7 restore
https://neosmart.net/wiki/restore-to-factory-settings/

A reload to factory settings is an extreme action !