what drivers are you using, what condition is the Cables at hopefully new as a common issue can be cables getting old. Amd cards are very picky with cheap cables I found with my own experience, another thing is make sure you got a decent PSU way over wattage could be your PSU not putting out enough juice after boot to drop 1 monitor. I suspect either PSU or cable issue if everything was working fine before. Another idea is reinstall your OS to suit with fresh Bios & video card drivers could be a corrupted update from switching from intel to AMD. I suggest to reinstall windows first then check all cables & PSU as well run a power usage app to get the true value of you system full power draw.
Thank you for the reply, My bad for replying so late, work and stuff.
Anyhow, The challenge is to try to find a solution witouth re-installing windows, i have a sql sever running with a few VM's with scrapers.
Since i need any solution witouth installing i went ahead and installed a watt meter, The system pulls only 150 wat booting up, so the psu of 700 wat should be no problem?
The cables are brand new, not to mention when the amd driver is un-installed the monitor 3 is showing image, only when the driver gets installed it dis-appears.
Any other suggestions perhaps for me to check?