AMD constantly changes signature check. Try an older drive then 16.9.2
I was reading that 16.9.2 no longer works on windows due to signature check.
Flashed bios that is.
Thanks Philip, but I still don't think it is a problem of the AMD software version. Unless I am totally wrong, I swear I have read several times in this forum that versions 16.9.2 is stable and works with claymore.
Besides, my present configuration does work: If I plug the HDMI dummy on the mobo HDMI port I can mine at 23-24 MHs, but overclocking does not work. If I plug it on the GPUs, I can overclock but I can't mine. In both cases I can't check temperatures. I think it is related to a software conflict between Afterburner, Wattman, Claymore and the HDMI port being "used" by the HDMI dummy. Or due to some step in the rig setup I totally missed...
In any case, just in case tomorrow I'll try an earlier version of AMD...