Screen flickering/FLASHING on R9 390

[AT90]

since more than a week I have been facing screen flickering issue on my Sapphire r9 390 which is accompanied by device attachment/detachment sound. This flickering even persists when i remove all of my usb devices(keyboard, mouse) and I have tried changing my VGA cable along with hdmi to VGA converter. 

I have tried upgrading my software to the latest driver available and tried few old versions of the drivers. At that time I had Windows 10 Pro as my operating system. I reinstalled Windows 10 and upgraded it to the latest version in an attempt to solve this issue. The only step that seems to solve this issue is disabling the AMD Radeon R9 390 Series display adapter from device manager.
 

I thought this could be a Windows 10 problem and on 10th june I reverted back to Windows 7 Professional, however I am facing the same issue. Even In Windows 7 the problem would only be resolved when i disable the AMD display adapter from device manager. 
(Disabling Intel HD Graphics 4600 only doesn't solve this issue).
 

The screen flickering is not continuous, It is random, usually starts within 30 minutes of bootup. As it starts occurring, I disable AMD adapter for few minutes and re enable it. This usually resolves the problem until sometime. The possibility of bad HDMI Output of my gpu is also ruled out as screen flickering occurred even when I connected my LCD to motherboards VGA output(while my gpu adapter was enabled). Also I do not overclock any of my system's components.

System Configuration:
Motherboard: GA-H97 HD3
CPU: Intel i7 4790
Memory: Kingston 8GB DDR3 
GPU: Sapphire R9 390
VBIOS: 113-2E3240U-X4A
Driver: Crimson 17.6.1
OS: Windows 7 Professional (version 6.1 build 7601 SP1)
Monitor: Samsung SyncMaster 943SNX Plus
 

One important thing, while I was on Windows 10 and i used to disable AMD graphic adapter from device manager, somehow graphic card would still provide display but screen flickering would stop. This is confusing as I have tried different operating systems and different version of graphic drivers so it doesn't look like software issue. But if it is hardware issue, shouldn't there be screen flickering even after disabling the graphic adapter from device manager?

[PeachyUwUSenpai]

try using a different screen since either the card could be failing or your screen could be 

[Billy_Mays]

Did you update your drivers because it could cause the symptoms your experiencing 

[AT90]

12 minutes ago, Alaradia said:

try using a different screen since either the card could be failing or your screen could be 

less likely chance of screen failure as I am currently using the same screen while my graphic adapter is disabled from device manager.
 

12 minutes ago, Billy_Mays said:

Did you update your drivers because it could cause the symptoms your experiencing 

I have tried different versions of the drivers and different operating systems, still facing the issue. Also I have tried clean uninstalling graphic driver before updating to the latest version(through display driver uninstaller).
 

[Billy_Mays]

1 minute ago, AT90 said:

less likely chance of screen failure as I am currently using the same screen while my graphic adapter is disabled from device manager.
 

I have tried different versions of the drivers and different operating systems, still facing the issue. Also I have tried clean uninstalling graphic driver before updating to the latest version(through display driver uninstaller).
 

Then your card or monitor is dying

[AT90]

I have tried changing my monitor, same issue.

[AT90]

I have come to a realization that screen flickering is more frequent and quick when GPU intensive work is going on. I have tried GPU stress testing several times through FurMark, every time(except once) testing was affected due to screen flickering, though the testing continued after screen flickering stopped as FurMark did not crash(there was downward spike in gpu temperature graph due to screen flickering). Only Once I had been able to carry out stress testing for 30 minutes without any screen flickering through FurMark followed by 3D Mark 11(basic edition).

[AT90]

I've had my GPU installed in a completely different system and It's still causing flickering issues. It is definitely a hardware issue so I am going to RMA it soon. Thank you for your help.