Error I've never seen before with SE 360 Fightstick

My friend has an SE fightstick which I dualmodded with a PS3-only Cthulhu. The other day, he says the stick stopped responding, and the turbo lights just flash repeatedly when plugged in. He did check to make sure it wasn’t switched to PS3 mode accidentally (DPDT switch), but the lights continue to blink.

I’ve seen where the guide button goes solid, then turns off (sign that the 360 board is dead), but never where the Turbo lights just continually flash and nothing registers on the stick.

Does anyone have any ideas on what this means?