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What may cause DM8168's HDMI and siI9022's DVI uncompatible with samsung's monitor?

Since before we use hisense's tv and philip's monitor to debug our box.

And now we add two samsung's monitor.But both DM8168's native HDMI and siI9022's DVI can't display content on samsung's monitor.

For monitor support up to 1080P60.

What may cause this uncompatible problem?

Thanks for any reply.