cannot turn on my acer laptop

[anasmuhammad31]

i need help to reset bios or something else because my acer 4750G screen is blank and automaticly shut down and turn on repeatly after i install grafic nvidia bios.

 

[Frank Hodgins]

I can think of 2 things you can try. #1 did you try using an external monitor?
#2 if that doesn't, is there any sounds like it is booting? or does it seem to be stopping before anything even shows on the screen? If the second is true, I would suggest either see if the video chip is one that can be replaced. If so replace it. Another option would be to remove the power, and the battery. Open the back of the system and find the bios battery. Remove that for a few hours. That might reset the bios.