Black screen (No signal)
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Document here all the situations where one might have a black screen, and the solution for each situation.
After installing a new graphic card
- Your mother board has an integrated graphic.
- You have just installed a dedicated graphic card.
- You boot the computer, but the monitor does not receive any signal and remains completely dark.
- In order to conserve resources, the mother board only powers one graphic system, either the integrated one, or the one installed on the PCI-e slot. Which one it powers depends on settings in the BIOS. If your monitor is plugged in the other one, it will not receive the signals routed by the mother board to the other port.
- The exact solution will widely differ from one type of mother board to another. Check the manual for your mother board or check all the available settings in your BIOS. Help us document various situations below.
Solution as seen in the following mother boards:
- ASUS M4N68T-M
Such mother boards offer the choice between three types of graphics adapters.
- IGP: Integrated Graphic Processor, the on-board graphic processor, the one used if you do not have a dedicated graphic card.
- PCI-e: a dedicated graphic card installed on the PCI-Express slot of your motherboard.
- PCI: a low performance graphic card installed on a PCI port. It is only useful if the on-board graphic processor (IGP) is broken and completely unavailable, and you need a card to temporarily access your BIOS settings to select the PCI-e graphics adapter.
In the BIOS, go to: "Advanced" > "Chipset" > "SouthBridge Configuration" > "Primary Graphics Adapter".
You have two choices:
"PCIE -> PCI -> IGP" and the reverse, "IGP > PCI > PCIE".
So, if you want to install a PCIE card, you must select the first option and save the new settings before you plug your monitor into the dedicated card and reboot.
If on the other hand you want to test things further with the on-board graphics even though a dedicated card is already installed in the PCI-e slot, you must select the second option (starting with "IGP"), save the BIOS settings, plug your monitor in the proper slot and reboot.