'No signal' means that your monitor is not receiving a video signal that it can display. This is usually due to one of the following causes:
1- The cable going from your computer to your monitor is loose. Power off the monitor, re-attach the cable at both end, power on your monitor. (This step is N/A if you have a laptop or an AIO.)
2- The signal your graphics card is sending to your monitor can't be displayed by your monitor. Boot the computer to Safe Mode, choose a low resolution signal, restart your computer normally, switch to the 'Recommended' resolution for your monitor.
To change the signal resolution: Start > Settings > System > Display > Display resolution.
Your problem is not related to your BIOS, unless you made changes to the BIOS yourself.