big motherboard problem

changed the bios on my motherboard, now the screen will not come on.  I need to change them back?

my motherboard has no jumpers, what to do

[Moderator]

What did you change and some specs about the system would be helpful.

Thanks for replying.

I now nothing about computers this is my sons computer, all i can tell you is that when my sons was playing games his computer kept crashing, he was told to change his bio settings to Optimal, since he done this, his computer stats up but nothing appears on the screen

[Moderator]

Enter the BIOS by whatever means it takes, and change the settings from optimal to safe. et us know what happens.