No boot, just blue LED

As the title says, one of my UpBoard will not boot any more.

I use a 5v/2A that worked great and still power 3 other Upboards.

When connected to a power source just a blue LED turns on. Monitor goes into sleep-mode, so no power out the HDMI. The Ehternet LED's don't light up eigher.

It worked the last time I've used it (a month ago).
Please assist, thank you!


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