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kimkimon Since ni boot sya without the Video Card, try uninstalling the AMD Video Card Driver through control panel. Since dili paman ka boot using your Video Card, you need to uninstall the AMD Graphics Card Driver using your Belt In Graphics sa Motherboard. After nimo ma uninstall ang AMD Graphics Card Driver, try paslak balik sa imong Video Card. If mo boot sya with your Video Card, then you need to reinstall your Video Card Driver.
Another possible solutions for this is "system restore" prior to the problem started. You could also perform a repair installation, if naa kay Windows 7 Disc. Another way also is to boot your computer to "Safe Mode", as if MS Drivers are running, so it should be your drivers aren't working.