ESP 8266 does nothing after disconnecting and connecting

[doct0r_bright]

Hello,
I'm currently trying to use the ESP 8266 module, but after I plug the Arduino out of the USB cable and into a normal DC cable, nothing happens, even though it was programmed to blink when it is any other state than “WL_CONNECTED” and to light up when it is that state. Is this normal?

Edit:
Found the solution, my problem was that the code was erased because the IO0 Pin was grounded.

[Idahowalker]

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[StefanL38]

@doct0r_bright

I'm currently trying to use the ESP 8266 module, but after I plug the Arduino out of the USB cable and into a normal DC cable,

It is unclear if you use a combination of an ESP8266 and Arduino or an ESP8266 standalone.

So please describe in detail what you are using
post a schematic how these things are wired together
and post the complete sketch you are using.

best regards Stefan