MC71
 
Hello there,
Sorry for the trouble.
Could you please send us a picture of  SN code at the bottom of machine ?
Please reset the system as follow:
1)Enter the safe mode, and reset the system.
          Start your PC, just as Windows attempts to load (spinning dots), press and hold Power Button for 5 - 10 seconds to perform a Hard Shut Down
          Do this many times until Windows  boots into the Recovery Environmen.
2)If Windows will boot into the Recovery Environment and from there you can access System Repair, Safe Mode, Command Prompt . . . etc.
      Please try each option one at a time, then see of Windows will boot . . .
      Go to Troubleshoot - Advanced Option - Startup Repair
      See if Windows startup can repair itself
      Go to Troubleshoot - Advanced Option - System Restore
      Check to see if you have a restore point you can go back to          
      If you do not have a Restore Point, go to Troubleshoot - Advanced Option - Startup Settings and click Restart
     Upon restart, press 4 to enter Safe Mode
     Once in Safe Mode, backup your data if you do not already have a backup
     Open Device Manager and check to make sure all your Drivers are up to date
     Reboot to see if Windows will start Normally
   3)If the above fails, go to Troubleshoot - Advanced Options - Reset this PC
         Choose to keep your files and apps, just your files or to keep nothing
         Then start the Reset
Have a nice day!