Shut down. Turn off the monitor and power at the wall outlet. Disconnect the monitor.
Remove the side panel from the case. Remove the display card from its slot.
Clean the slot and the card's edge connectors. Refit the card and ensure it is firmly seated in it's slot.
If it still doesn't work when you reconnect it all and power up, then replace the display card.
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Grandad
Offline 3,826 posts
since Mar 2004