ive got the strangest thing…
i have three boards..one is a older discovery board witch is in my midibox SEQV4
the two other are new one from mouser (STM32F407G-DISC1) they are programmed with the same bootloader and latest seqv4 0.91 software…the older works fine but the new ones do not work…
the problem is …
when i power it from the micro usb…it does not show anything in the displays…but when i it power from the mini usb …it does work
(the core board with the cardreader are both the same and work fine).
what can this be ?

