everything can be possible:
1. the problem with PSU (cables)
2. The powering for/to USB Riser
3. USB Riser/ loose installation.
4. Windows is corrupt
5. a dummy output.
1.Changed psu, not from here
2.Maybe - need to try
3.Nope
4.If nothing on the hardware part works, i will need to try a fresh reinstall.
5.How so?I only use onboard vga when i connect the rig to a monitor.Other than that i connect to it with remmote desktop.