OP confirms:
BIOS settings are correct
PSU connected
We even have new RAM (so two different sets of RAM have been tested)
Device Manager does not see the card
Drivers are irrelevant. You have either a failed or an unsupported video card (I will wager all of LC's treasure on unsupported hardware). You also have chipset errors out the wazoo and Windows is not activated.
Your video card is the lesser of your problems. Uninstall Windows 10, install Windows 7 or 8.1
This is an XP class board with Windows 7 support
Gigabyte does not specifically state full 8.1 compatibility, but they do provide a LAN driver - a reasonable indication that the other chipset/hardware drivers are available elsewhere, probably the Windows 8.1 install.
This step is mandatory. Then we can address the video card.
BIOS settings are correct
PSU connected
We even have new RAM (so two different sets of RAM have been tested)
Device Manager does not see the card
Drivers are irrelevant. You have either a failed or an unsupported video card (I will wager all of LC's treasure on unsupported hardware). You also have chipset errors out the wazoo and Windows is not activated.
Your video card is the lesser of your problems. Uninstall Windows 10, install Windows 7 or 8.1
This is an XP class board with Windows 7 support
Gigabyte does not specifically state full 8.1 compatibility, but they do provide a LAN driver - a reasonable indication that the other chipset/hardware drivers are available elsewhere, probably the Windows 8.1 install.
This step is mandatory. Then we can address the video card.
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