I am facing similar problem.
Seems jaguarboard will going to sleep state, Although I set Win10 without power saving.
Press all button on the board, never bring system back.
Need power cycle to boot up system.
Can you ping the device? Alive or not? You mean whole device is sleeping or just HDMI sleeping?
The board seems to boot up (all leds light on), but not video output.
Can you change a monitor to try? or HDMI cable? I think your TV has hdmi ports, try to connect your TV.
Sorry sir I just got one monitor support dvi.
Im done trying on all my TV hdmi port still the same sir no signal output. My android box tv work fine on all port..
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