could you share you *m5f file for our? that will very helpful for us to find the bug.

you need setup the device to the USB mode before you connect to the Desktop IDE

more information you could refer this tutorial:

https://docs.m5stack.com/#/en/quick_start/m5stickc/m5stickc_quick_start_with_uiflow

i have check the prodcut document.then i find this information, i guess this sensor need calibration:
Nominal B-Constant： 4250 ~ 4299K

if still can't work normal. maybe you could try to contact seeed store

https://wiki.seeedstudio.com/Grove-Temperature_Sensor_V1.2/#specifications

@devilstower you could try to upload the FactoryTest then check the serial log. if log normal and the screen still dark. you could contact the store.

just like him said. don't comment the M5.begin();

@robalstona

him mean is these product:

YUN：
https://m5stack.com/collections/m5-hat/products/m5stickc-yun-hatsh20-bmp280-sk6812

ENV-HAT:
https://m5stack.com/collections/m5-hat/products/m5stickc-env-hat

@morris45 we don't have example code to setup it low power to 10ua. even if you shutdown the IMU and screen . current still is mA level

@morris45 i has ask our engineer . even if the esp32 deepsleep, other electronic component still work. like imu, axp192 etc. even if you seting the IMU to sleep mode the esp32 can't possible low power to 10uA.

you could check your code does have operation for AXP192. usually esp32 sleep don't affect the AXP192 output.

@morris45 for the time being. only provide pin map schematic. don't provide electronic component parameters.