Unfortunately I cannot even get into the BIOS at this point… 
VGA or HDMI both work as long as it is connected directly on the motherboard. You need to try to boot without graphic cards before plugging them. If it does not work check if:
- CPU well plugged
- CPU fan plugged
- MB plugged to the psu
- RAM is well plugged
Unfortunately I’ve tried checking all of those things, and still no output to the monitor 
Do you have keyboard plugged? If yes do you see the lights turning on when you boot the rig ?
Maybe someone gave this answer already but did you make sure that you plugged the monitor into the gpu on the main 16x pci slot. It is the second one plugged in on an proBTC. I think I had this problem when I built my first rig. Hopefully it’s as easy at that.
Hi all,
@owocki here. I had to create another account because the forums won’t let me post more than a half dozen times per day.
I tried the following. No luck.
DVI monitor on 1070 GPU
VGA monitor on onboard GPU
HDMI monitor on onboard GPU
HDMI monitor on 1070 GPU
and… F2 key on keyboard when booting for each of the above.
I also tried the GPU configurations both with the risers, and directly connected to the 16x GPU.
Anyone have another tip for me? I’m starting to think either my motherboard or CPU might be DOA.
nope I do not unfortunately. What does that mean?
You can change ram socket it in the other ram
Without any gpu should at least see the bios starting up but if you dont see this …
Then are you sure the monitor is working?
just tried that. unfortunately, still nothing 
Try typing N a few times after turning on the rig. There is a warning splash screen before anything loads if you have a multi gpu setup. I don’t know why it wouldn’t be displaying it but it can’t hurt.
My thoughts are close to this as well. I can only see one 4 pin molex power plugged in the first picture here. Read your motherboard manual and see if it tells you that you must plug in 2 molex 4 pins to the mobo for more than 3 GPUs. If you have not done that already.
Tried the “N” key. No luck.
RE: 4 pin molex, I only have 1 GPU connected right now.
going through these steps, my first two gpu’s worked, but no signal on the 3rd (so 3 of 6 gpu’s plugged into the mobo didn’t work). You didn’t happen to run into anything similar did you?
thanks for the help!
EDIT - actually i show all 6 gpu’s on ‘device manager’, but it looks like the only gpu i can connect to the monitor through is the 2nd PCIEx16 slot.
@JT08 I’ve just got my device to boot (got a new mobo and cpu), and am going through the process of installing ubuntu now.
Nice. You got all GPUs showing up on the device manager. I dont think you really need to connect the others to a monitor. Just need to be able to mine off them 