Hi! Check, check and check. Still no boot. I can get other things to boot, but this is killing me since I'm fairly proficient with this kind of stuff.

Hey all,   New to the Pi, but this is a cool project for me.   However, I can't even get Recalbox to start to load. When I unzip the most recent build of Recalbox (beta 3, I believe) file to the root of a FAT 32 formatted sd card and load it in, all I get is a red LED on the Pi and it never loads.   Any advice?