New build PC with installed Windows 10 Home version
Monitor input from first HDMI (1st)
initially GPU card fan was spinning, but once finished installed AMD display driver, then monitor go to black screen & GPU fan stopped spin
when rebooted straight, that monitor to black screen (when boot to windows).
Google all the posts, but no solution & tried many suggestions but no luck.
Purchased addition DVI to HDMI cable & connected to monitor second HDMI (2nd)
finally able to see the windows screen & can AMD Radeon setting app
*still figuring how to switch back to HDMI (1st)
Boy you got a good question there. It could be that for whatever reason on the one system you just need a bit more power ceiling for the card. So try this:
Radeon Settings/Gaming/Global Settings/Global Wattman: Find the "Power Limit" Slider and move it to it maximum.
If this doesn't help I think you are right and have either a driver issue, bios issue (is that up to date on the new motherboard?) or other hardware issue. At that point I would open a support ticket with Saphire or with AMD if they can't help. The link for AMD is on the contact us page of their website at the bottom.