Original title: windows 8 no user name and login password only blue screen

Username and password login box but instead i got blue screen with the power button at the lower right hand corner. No installation nor recovery disc available.

We need more information to assist you, please answer these questions.

What is the make and model of the computer?
Did you make any changes to the computer prior to this issue?

Remove the externally connected devices, restart the computer and check. If the issue still persists, refer to the following information.

Automatic Repair is a Windows recovery tool that can fix certain system problems that might prevent Windows from starting. Automatic Repair scans your computer for the problem and then tries to fix it so your computer can start correctly. Run Automatic repair and check if it helps.

a) After you boot your computer using Windows DVD or System Repair Disc, a black screen appears with gray text "Press any key to boot from CD or DVD". Press any key.
b) Select the correct time and Keyboard type.
c) Click Repair your computer in the lower left corner.
d) Select Troubleshoot from Choose an option screen.
e) Click advanced options in Troubleshoot screen.
f) Select Automatic repair.