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HP Elite t655 Thin Client (56X64AV)

There has been an unexplained phenomenon that I wanted to share with this. This has happened three times. After the bios is upgraded, the Thin Client will reboot as expected. Then the screen will go black. The only solution is to unplug the HDMI cable from the thin client and plug it back in. It did not happen every time, but it did happen three times. We attempted to solve the problem by rebooting the Thin Client, but it did not help. The only solution was to unplug and replug the HDMI cable. Strange days indeed...

This is a problem with Main Board or BIOS update is damage?
Who can help Me with this issue?

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