Ryzen 3600
Gigabyte b450 Aorus Elite (had shop flash it to work with Ryzen 3)
Corsair 16gb RAM
Intel 660p m2 drive (have 3 other drives as well but all disconnected whilst trying to sort this)
Nvidia GTX1070
Nvidia drivers are downloaded through geforce,experience and are up to date.
System worked fine for few weeks before this started. Some other background to this - when problem originally surfaced about a month ago I tried various stuff including updating the BIOS. I did it through the gigabyte desktop utility, and it seemed to work fine, but then when I restarted the machine wouldnt POST. The debug lights on the board suggested it was stuck on the RAM startup. I sent mobo, RAM and CPU back to shop. They tested and found RAM and CPU fine, but found some track damage on the mobo, which they sent me a picture of (I wasn't aware of this happening during building, but had no proof otherwise, so...). They sent it back to gigabyte to see if they would repair or replace - that mobo is still currently with gigabyte. I figured gigabyte wouldnt cover it, so ordered a replacement board of same type, and got CPU and RAM returned.
Rebuilt machine with that kit, and problem resurfaced pretty quick. So obviously wasn't that track damage they found. In trying other solutions today I used the Windows install tool. I set that to reinstall windows but leave my files - it started then after a restart the machine went into the BIOS, with a message that the BIOS had reset. I restarted, and now my m.2 drive had disappeared. I powered off, unplugged other drives and reseated it. Now it restarted ok, and on the desktop got a message that the update had failed, message was: We couldnt install windows 10 , 0x8007025D - 0x20003 The installation failed in the SAFE_OS phase with an error during INSTALL_UPDATED operation.
So pretty weird shit basically!