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so the boards only need the correct firmware flashed onto it - with a Windows PC with a DP port

Thanks! Ok so that does explain it. Unfortunately I’ve tried both a windows 10 and windows 7 machine with display port and their flashing program supplied for the JRY-W9CHUD-AA1 doesn't recognise the card, in the supplied screenshots is shows it will detect the card instead it just says UNKNOW. Have tried a PC on windows 10 also windows 7, just power and display port connected. Hmm. Anyway thanks again for the reply. :)
 
WinISP (have tried a few versions) doesn't detect the card, but windows does. Doesn't detect the video card either. Does it need to be the only 'monitor' connected to the machine via Display Port? Might have to try screen sharing.
EDIT: Screen sharing didn't work either. Since WinISP doesn't detect the video card (in this case a GTX 1060) I will try and source another PC or video card.
 
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Have tried an RTX 4070 vs the GTX 1060 tried prior, still doesn't detect in WinISP, GPU or attached 5K board. :/
Has anyone had this? Does the board have to be put into a special mode to enable flashing?
 
Second successful conversion. Switched from iMac PSU to LRS-150-24 (LRS-200-24 is a bit too big to fit nicely). Fits perfectly, silent, barely any heat. Perfect for a fanless setup. Connected through a molex directly to the iMac connector.
 

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