Answer:
If I would have been there firstly I will not any for it second it has been happend to my PC 1 or 2 week ago if you are using Windows 7 cuz I have 7 . So two black screen appear press the reboot key and wait for 2nd screen, and if it would not come again reboot till it appear then press [Del]
key and some adjustments and press enter and it would ask for saving so press Y and enter you are all done