New
#11
One adjustment to what I mentioned above...
When you boot to safe mode, Device Manager -> Display adapter shows the identical name as it shows when you boot normally. Doesn't matter if you're in safe mode or not, the Display Adapter name will be the same.
So if the Catalyst drivers have been successfully and properly installed, the name shown will ALWAYS be "AMD Radeon HD5450", safe mode or not. This confirms that the video drivers for the HD5450 WERE INSTALLED SUCCESSFULLY.
However if the Catalyst drivers have not been properly or successfully installed, the name shown will ALWAYS be "standard VGA adapter" or similar, no matter whether you're running in safe mode or normal mode.
So if you currently show "standard VGA adapter" in Device Manager when you boot to safe mode, that tells us you do NOT have the Catalyst driver installed. It either didn't install successfully, or you've uninstalled it.
And that means you must also be once again using the original MS-provided vanilla generic VGA video driver, as you were right after the 64-Bit Win7 install completed and before you installed Catalyst (which runs in SVGA mode) and got into trouble with the black screen.
Are you now operating successfully this way, with "standard VGA adapter" showing?
Unless you replace the SMS19A100 with a newer higher-resolution monitor that can run in SVGA mode, I'm going to suggest you uninstall the Catalyst driver. The MS vanilla VGA driver is just as acceptable for your 64-bit Win7 as it was with your 32-bit Win7, which is what I suspect you were using in your previous 32-bit Windows setup.
I'm still wanting to know if you had Catalyst installed in your previous 32-bit Win7 environment.