Question PC won't boot, windows does not start after I unplug it. Is CMOS battery the cause of this problem?

[Jomer]

I just recently update my win 7 to win 10 and upon restarting it, it boots normaly. Also, when shutdown my PC but it's still plugged from the wall socket, it also boots fine. But whenever boot my PC after I unplugged it, it won't boot properly. It only shows the "AMERICAN MEGATREND" thing, which I think the BIOS, then the screen went black with an underscore or maybe hyphen blinking on the upper left part of the screen. What is the possible cause of this? Please help.

As of now I keep re-installing win10 to my PC whenever my PC gets unplugged from the wall socket

 

[alexbirdie]

Any reaction, when pressing F1 ?

CMOS-battery should not be the cause, because if empty, BIOS should be loaded with default-settings.

 

[Jomer]

Any reaction, when pressing F1 ?

CMOS-battery should not be the cause, because if empty, BIOS should be loaded with default-settings.

Nothing happens when I press F1. Do you have any idea for its cause?