In the previous post I meant to say that the backlight is on, sorry for the typo.
Anyways, I tried the Adafruit ILI9341 library graphics test, as well as this MicroMod library https://github.com/paulvha/MicroMod/tree/main, and both do give me output showing that there is communication between the screen and the Sno M2:
ILI9341 Test on MicroMod Input and Display carrier board!
Display Power Mode: 0xFF
MADCTL Mode: 0xFF
Pixel Format: 0xFF
Image Format: 0xFF
Self Diagnostic: 0xFF
Benchmark Time (microseconds)
Screen fill 1303852
Text 147332
Lines 1199496
Horiz/Vert Lines 109820
Rectangles (outline) 72904
Rectangles (filled) 2707460
Circles (filled) 424272
Circles (outline) 511188
Triangles (outline) 265516
Triangles (filled) 1212032
Rounded rects (outline) 225924
Rounded rects (filled) 2735580
Done!
I also was able to get the LEDs to flash using the MicroMod library linked above. So at this point it looks like the screen is defective. I have contacted SparkFun to see what happens next.