No signal detected - computer turns on but no display output

[billyb]

I have built a computer (over a year ago) which I originally put yosemite on, which i replaced with Windows 10. However I have now accidentally deleted windows 10 off my hard drive (clever, i know) and i wish to put sierra onto it now. I have a usb with sierra created by unibeast ready to use except... my computer (with no OS) will not display a startup screen, I can not get to the BIOS or the boot selection, nothing displays. The computer does turn on and all the fans turn on but I can't see anything. After i deleted windows 10 the BIOS was still working but after changing BIOS settings (i disabled vt-d) the computer has now failed to output anything. I have tried taking the CMOS battery out, taking the RAM out and putting it back in but nothing has worked. I would really appreciate any help. Thanks, Billy

 

[silvoc]

I just found this thread (unfortunately I have already posted the problem here (https://www.tonymacx86.com/threads/bios-not-showing-up-power-on-led-on-fans-on-no-beep.208434/).
It is exactly the same problem I am facing...

Thanks,
Silvo