nodemcu always flash hardware

Hey, I have a problem with my microcontrol.
my micocontroller always flashes first when I upload the program, and when it's finished uploading can't display something even though it's the "hello word" in the serial monitor. What should I do?

this note in arduino ide :
esptool.py v2.6
2.6
esptool.py v2.6
Serial port COM3
Connecting....
Chip is ESP8266EX
Features: WiFi
MAC: 5c:cf:7f:fd:84:e1
Uploading stub...
Running stub...
Stub running...
Configuring flash size...
Auto-detected Flash size: 4MB
Compressed 273056 bytes to 198539...

Writing at 0x00000000... (7 %)
Writing at 0x00004000... (15 %)
Writing at 0x00008000... (23 %)
Writing at 0x0000c000... (30 %)
Writing at 0x00010000... (38 %)
Writing at 0x00014000... (46 %)
Writing at 0x00018000... (53 %)
Writing at 0x0001c000... (61 %)
Writing at 0x00020000... (69 %)
Writing at 0x00024000... (76 %)
Writing at 0x00028000... (84 %)
Writing at 0x0002c000... (92 %)
Writing at 0x00030000... (100 %)
Wrote 273056 bytes (198539 compressed) at 0x00000000 in 17.6 seconds (effective 124.3 kbit/s)...
Hash of data verified.

Leaving...
Hard resetting via RTS pin...

Please post your full sketch.

If possible, you should always post code directly in the forum thread as text using code tags:

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