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Hello and welcome to Justanswer, My name is ***** ***** I will be assisting you today,
I'm sorry about the issue, Please try one of these methods :
1-switch off your device by pressing the Power key
2-Afterwards press and hold together: Volume Up + Home button + Power button.
Please see this image : http://www.hardreset.info/media/resetinfo/2015/078/6c2f8bc2d20941188cec66eb907a6e1a/samsung-t530-galaxy-tab-4-101.jpg
3-You should release held keys when an Android Icon appears on the screen
4-Select "wipe data / factory reset" by using Volume buttons to navigate and Power button to confirm.
5-Afterwards choose "Yes -- delete all user data" to confirm whole operation.
6-When the Recovery Mode appears again select "reboot system now".
1-If the display is off, press the Power to turn it back on.
2-Afterwards go to Settings and then to Backup & reset.
3-Tap Reset Devive.
4-Choose Erase Everything if you are sure you want to clear all your data.
5-Select OK to confirm the whole operation.
Hope this help
Ok, I'm sorry, Please try to follow the step by step instructions in this tutorial video : https://www.youtube.com/watch?v=j7G93cWDVqo
Let me know if you find any difficulty.
Note : Please do not Rate my answer until we finished with the session. Once you are satisfied please RATE 4 or above.
Please when you turn on the PC did you tap F11 repeatedly?
Also Try to restart your computer and Press "fn" and "F12" or "fn" and "F11" keys at same time on laptop keyboard, just after you see the bios screen and before you see the windows start screen. If your computer has a built in recovery partition, this will open up a factory restore. Just follow any instructions it gives you.
If you are using a DVD recovery disc it will bring up the boot menu, scroll down the list with the arrow keys, and select the DVD drive, make sure the DVD is in the drive and press Enter. Follow the instructions the DVD gives you.
This is Another solution That comes directly from lenovo :
Note: All personal data in the computer will be lost during the recovery procedure.
Follow these steps:
Let me know if you need further help