I installed a new GTX 780 video card in my PC to replace my AMD HD 7950. Uninstalled all the AMD drivers using Control Panel in Windows before physically removing the card. Installed the NVidia card and installed the drivers. Everything seemed fine. Today the PC hangs at the loading screen with the Windows logo and the circling dots. Powering down completely and restarting brings up an automatic repair message, but then the screen goes blank although it's still powered on - no message that the signal is gone. I tried booting off a Win 8 USB drive and the Win 8 CD, but it just spins without ever giving me any menu options.
I have 2 hard drives in the machine, the second drive has Win 7 still on it and I F8 boot into it sometimes. So I figure I'll just boot into Win 7 and see if it's working. Same problem; it stops at the Win 7 loading screen with a pulsing logo similar to the spinning dots in Win 8. So I figure I'll go into Win 7 safe mode. I boot up, select safe mode in Win 7 and as the drivers scroll down it stops and freezes at AtiPcie.sys.
I removed the Nvidia card, reinstall an AMD card, and Win 8 does the same thing. By the way, I also uninstalled the AMD drivers in Win 7 but I never installed the Nvidia drivers.
What in the world would cause both Win 8.1 and Win 7 to stop at the loading screen, and why won't Safe mode in Win 7 even start?
I have 2 hard drives in the machine, the second drive has Win 7 still on it and I F8 boot into it sometimes. So I figure I'll just boot into Win 7 and see if it's working. Same problem; it stops at the Win 7 loading screen with a pulsing logo similar to the spinning dots in Win 8. So I figure I'll go into Win 7 safe mode. I boot up, select safe mode in Win 7 and as the drivers scroll down it stops and freezes at AtiPcie.sys.
I removed the Nvidia card, reinstall an AMD card, and Win 8 does the same thing. By the way, I also uninstalled the AMD drivers in Win 7 but I never installed the Nvidia drivers.
What in the world would cause both Win 8.1 and Win 7 to stop at the loading screen, and why won't Safe mode in Win 7 even start?