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

Oct 21, 2019
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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!
 
Oct 21, 2019
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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?
 
Oct 21, 2019
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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?
 
Oct 21, 2019
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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
 
Oct 21, 2019
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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...
 

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