Thank you all for the advice. Managed to solve the problem with a newer model of monitor. The logic that I believe could be behind the problem is that the monitor is manufactured before the UEFI release and they are not compatible hence no video. I found a newer model of monitor and that is how I managed to get in BIOS and return to legacy boot. Now I have a video signal. Resetting BIOS/CMOS with the battery out, or reset with the jumpers did not return to legacy bios mode.  Anyway, lessons learned: Some older monitors (pre 2007?) may not be compatible with UEFI BIOS boot.   Cheers                
Hello, I am seeing this issue all over the internet, but for me is still not resolved. Optiplex 9020 i7 8GB 250GB SSD. No Graphic card. Monitor works on different PC. I was trying to install fresh Win10 on a new SSD and after the install, I went to swap the boot drives and also turned on the UEFI with a secure boot in the BIOS as a new boot option.  After that, the system starts but doesn't give any video signal, no Dell logo nor anything else. The CPU, the fan, the power light all work normally. If I can access the BIOS I would revert back to legacy mode, thinking that may fix the issue. I have tried resetting CMOS by moving the jumpers and also tried removing the battery. I got a new VGA cable but there were no results. I have tried pressing on/off F2 and, or F12 to get in the BIOS/boot options, but no results, still no video. It seems to be an old problem, just can't find the solution for myself. Can anyone advise, please? Cheers Pete
No video after switching to UEFI/ New install of win 10