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On 25/11/13 21:18, Gordon Henderson wrote: > On Mon, 25 Nov 2013, Philip Hudson wrote: > >> My son's Raspberry Pi rev B boots from its 4GB SD card (Raspbian) only >> intermittently. It was running fine at home before we shut down >> (properly) >> and disconnected it to take it to Exeter. At Exeter, to our not very >> great >> surprise, it again refused to boot. Paul helped us eliminate several >> possibilities at the Pi Jam in Exeter on Saturday; here's the latest >> update. >> >> First to recap (well, it's a recap for Paul), at the Pi Jam, with Paul's >> help, we tried the following (all failed to do anything but show the >> board's ROM start screen): > > There is no ROM startup screen. > >> * Different power adapter >> * Different card, same board >> * Different board (Paul's, also a Rev B), same card >> >> * Mount and check our card on Paul's board booting from Paul's card, >> using >> Paul's USB card reader >> >> So we gave up and enjoyed checking out everyone else's geeky stuff, >> and it >> was great, and we went home, and we plugged everything back in the >> way it >> was in the morning, and it booted and ran fine first time. >> >> So, I conclude, that the explanation is one of the following: >> >> 1. Our board likes using analog composite video out, which is what we >> have >> here, a bit more (but not enough to be deterministic even here) than >> digital HDMI-to-DVI-D which is what we had in Exeter; or > > If using HDMI, then the target device must be enabled and turned on > *before* you power up the Pi. The Pi detects the presence of a working > HDMI capable device in milliseconds after power up and if it doesn't > detect one, it will switch to compost video output. This was the case, i powered down my own pi, unplugged the power lead, plugged in phils sd card and then powered it back up again. Paul -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/listfaq