Restart your computer now as soon as you hit the power button keep on holding Alt key & keep on tapping F10 key Alt+F10 it will open the recovery console select full factory restore and follow on screen instruction
this may vary depending on your computer and operating system
(Note:this will erase all datas on the computer)
or you might try
Restart your computer during the boot process you will see on the screen to press a certain key to enter setup
Press and hold that key during the boot up process to enter BIOS using the arrow keys you can load failsafe defaults or load optimized defaults ,press escape then press f10 to save to cmos to restart You will also need to set the time and date
hope it helps
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