Question ASUS B250 Mining Expert | No Bios - Boots to black screen with cursor, no signal after CMOS reset

[Njck]

I’ve got a problem with my Asus B250 motherboard. I had a previous board that worked flawlessly with 9 cards for 3 months. I moved the rig recently and it fried the mobo when I hooked it back up... Anyway I’ve ordered a new one and I was initially having problems with some of the GPUs booting normally but others where the fans just keep spinning which is usually a riser issue. I decided to go from 4 PSU to 3 PSU in case it was an issue there with power balance etc. Still no luck. Last night I managed to get everything hooked up nicely and it seemed to like it to begin with but it booted to a black screen with cursor in top left corner. I reset by removing battery, turned on and now it gives me nothing on screen. Fans and CPU appear to be on but just nothing...


As a sidenote, i've already returned the new board for a second new one and the same issues, so ruling out the mobo being the problem.

Heres my setup;

1000W EVGA PSU – CPU, SSD, 3 X Radeon Vii & 1 X Vega 64, risers for these GPUs and molex to PCI ports on board, I know people say you don’t need these with powered risers but when my rig was working it would only boot with these plugged in.

750W EVGA PSU – 2 X Radeon vii and risers

750W EVGA PSU – 3 X Vega 64 and risers

I've tried plugging all PSUs into board and now i've left it how I originally had it with Add2psu from 1000W PSU which is powering the board plugged into 'A'.

Ram – Ballistic 8gb 2666 Mhz


Really appreciate any help, it's driving me insane!

 

[COLGeek]

That is an indication that the BIOS can't find a bootable storage device.

 

[Njck]

It should still let me access the bios though shouldn't it?

 

[COLGeek]

Yes. It should.

If you simplify your configuration, can you access the BIOS? Just a basic configuration.

 

[Njck]

So try booting with 1 gpu as an example to get into bios?

 

[COLGeek]

Yes

 

[Njck]

Thanks COL, I'll give that a go when I get home

 

[COLGeek]

Good luck

 

[Njck]

Ok, with one GPU, everything boots up fine, including windows...

Any ideas?

 

[COLGeek]

Add additional devices one at a time to isolate the issue.

 

[Njck]

Any more than one GPU gives me the black screen with cursor. I've re set settings to default, updated the BIOS to latest firmware and nothing. Tested other GPU/Risers and they work. Tested other slots and they work. I'm baffled...

Could it be the RAM?

 

[COLGeek]

Doesn't seem like memory issue. Can you check GPUs individually, without the risers?

 

[Njck]

I've tested each one individually. They all work fine. do you mean test each one individually in the PCI 16 slot? What would that tell me?

 

[COLGeek]

The intent is to identify whatever is preventing you from getting back to your initial config. Have you tested each of the PSUs individually?

 

[Njck]

I've tested moving the risers around to different PSUs, the only thing the other PSUs are doing are sending power to additional PSUs, so don't see why I wouldn't be able to boot up more than 1 from the other. Only thing I can think of that I have changed is that I had power running off A & C on the mobo, C having a daisy chain wire to start additional PSU, now I have 1000W on A and use 2 x add2psu for the other 2. So has to be that... I'll have to wait until I get home tonight to test

 

[Njck]

I've managed to get 6 GPUs working. As soon as I plug in 3rd PSU, which is only powering 2 GPU and nothing else, it goes to black screen with cursor. Tried replacing that PSU, same problem. It sounds like a power balance issue to me, but I have no idea how to fix it...