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Other issue
In power-saving mode, when the input source is DisplayPort,
PC display settings cannot be saved.
Go to System General and set Max. Power Saving to Off. Alternatively, configure the PC display
output settings again. Ensure the set is turned on.
When booting the PC with the input source set to
DisplayPort, the BIOS and booting screens do not appear.
Boot the PC when the set is turned on or when the input source is not DisplayPort.