: Your screen will flicker or go black for a second, and you may hear a beep.
After the reset de-asserts, the system must completely re-enumerate the bus. The vBIOS runs again (the initial boot ROM code that initializes the display), the driver reloads from scratch, and the frame buffer is reinitialized. This process can take several seconds, during which the screen remains black. If a secondary bus reset fails, the GPU is truly dead until the next cold boot of the entire PC. graphics card reset
: Fixing minor screen freezes, black screens, or lagging while gaming. 2. Reset Settings to Factory Defaults : Your screen will flicker or go black
"Restore your graphics card settings to their original factory defaults. This will remove any custom overclocks or performance tweaks." the driver reloads from scratch