Quote from: dragonmike on March 18, 2018, 12:53:30 PM

Guess I set GPU voltages too low. Or whatever. Anyway now Win10 will not start. What are my options?

Didn't boot when GPUs plugged? Means without GPUs on it your system worked?

Quote from: dragonmike on March 18, 2018, 02:33:10 PM

Quote from: leonix007 on March 18, 2018, 02:03:50 PM

How about Start up repair?

https://www.groovypost.com/howto/fix-windows-10-wont-boot-startup-repair-bootrec/

Does not work over teamviewer. Would have to hook up monitor and keyboard... 😑

Means your system worked but with blank screen? Or you put your rig in somewhere else?
Just tried to make it clear. It seems people above have mentioned a good advice.

Quote from: insider00 on March 18, 2018, 01:09:18 PM

plug out all gpus, motherboard battery, turn your motherboard on wait few sec then turn it off and put the battery back, go to safe mode, uninstall gpu drivers, then turn off, plug your gpus go to safe mode to flash new bios or using normal mode

If cards bios switching worked, that's good. If it didn't work, seems you need to do a CMOS reset and unplug all of your cards (like mentioned above). Try to boot with one card only, you are using Onda D1800, so it more simple, cause you put all card directly to PCIe 16x on board. Will not affected by many cables on the rig such as miners that were using a Risers. If possible, use a small card just to test (if you have it). Clean the driver and tune-up utility (if you were installing it), turn off your rig. Try with only one Vega first, if it works, plug another Vega, one by one would be better.