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I think this is now fixed if you update your build.
You can still use the Sandisk firmware, so reboot into that and copy an updated build of rockbox over.
From you original message it sounded like you were saying that Rockbox was failing to boot, not that the clip wouldn't turn on at all. These two are quite different.The manual tells you how to boot the OF (hold left while turning on IIRC).
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