Probably that sign was most likely a oversized screen connected to an embedded PC… a store not too far I live had their advertising billboard show a nice… “BOOT FAILURE. REBOOT AND SELECT PROPER BOOT DEVICE.” instead of the usual adverts slapped onto here…
I’ve yet to see one of these screen billboards show a “BSOD” that’d be something out of the ordinary :lol: I’ve even seen on Reddit pictures of such billboards showing TeamViewer error messages (see when I told ya that those billboard signs are mostly embedded PCs? These PCs usually play a video, but I did not knew for sure that some were connected to a remote server with TeamViewer, maybe they let the remote server do all the decoding as these embedded billboard PCs are usually not very powerful and built to consume the least power possible)