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RPi Easy SD Card Setup - eLinux.org

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Edit the configuration file, see the instructions at R-Pi_ConfigurationFile.<br />

Add the following line to the configuration file<br />

config_hdmi_boost=4<br />

You may experiment with different values of config_hdmi_boost. Value 1 is used for very<br />

short cables, value 7 is used for very long cables. At your own risk, you can go up to 11,<br />

but risk frying a sensitive monitor.<br />

Note that various adapters, such as HDMI-to-DVI, can also cause power loss and<br />

therefore require high values of config_hdmi_boost even with short cables.<br />

This option can also help when there is no display output at all, the display periodically<br />

blanks, or colours are wrong/inverted.<br />

This symptom can also be caused by RasPi +5V (measured from TP1 to TP2) falling too<br />

low. See Troubleshooting Power Problems.

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