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My Hp Deskjet 3755 is prompting an error code, which I can't find in the user manual. The power button is flashing, the control panel is flashing an E and no numbers, the resume and wireless light are also blinking. I am unable to connect it to wifi for some reason I have downloaded the HP smart app on multiple devices and tried to connect it multiple times with no luck. I have also added paper and a new ink cartridge. My wifi is also working fine I have tried it on multiple devices but cannot figure out what is wrong or how to fix it. Chat support hasn't helped. 

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