Sounds like the firmware isn't responding to G29. Most likely a problem in configuration.h define statements.
Not a Simplify3d issue, so you may have a better chance of getting help on a forum dedicated to your printer type or firmware. But if you want to post your printer details and a copy of configuration.h here, someone may be able to assist.
I don't see anything obvious wrong with configuration.h.
Are you sure you got a clean compile and upload? Go to the Communications window and use the "Emergency Stop" function. Marlin should echo out the build date/time when it boots. Does that match your compile date/time?
Maybe someone else here will see something I didn't and have some input -- but I would also recommend posting on a forum more dedicated to discussion Marlin or hardware.