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Lightcrafter 4500 does not boot up properly

I've removed the light engine from the lightcrafter.

My lightcrafter 4500 board was working fine just a few days ago but when I connect up the power today it does not show the splash screen anymore. The led D7 on the bottom side constantly lights green and red and the led D4 on the top side does not even light up. It also does not appear as a USB device on PC anymore.

I'm not sure what is wrong. Is the flash corrupted or have I accidentally shorted something?

Could you help me with finding out what's wrong?