Serial monitor problem when connecting external circuit...help?!

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hiii
i having problems in serial monitor when connecting circuit arduino pro-micro. couple of days before this, connect circuit , not see data in serial monitor connected gnd pin arduino  circuit , worked fine, try hour , day after , worked, when try today not longer see data in serial monitor if connected gnd pin did before.  can tell me or give me hint of problem now?

thanks!

can share current circuit diagram here.
i trying understand whether directly monitoring using serial monitor or using usb ttl device monitor result


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