I don't think your grounding suggestion is a long shot at all, I think it is likely to make a difference. Given the nature of many of the SD cards, in that they don't appear to meet the timeout specs, then the situation with some cards suitability is probably marginal and small changes in capacitive coupling to the ground plane could just change the waveform enough to tip it over the works/doesn't work boundary.dom wrote:Can you try a rpi-update:
http://elinux.org/R-Pi_Troubleshooting# ... g_firmware
There's been a couple of changes that could just have an effect. Basically pullups have been applied to sdcard and UART RX lines.
It is possible the additional grounding from HDMI is just enough to make a difference to these undefined signals.
(this is a bit of a long shot)
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