please put the charger back in and download and run an antivirus app like avast or malwarebytes. Afterwards, take out the charger again to check if the screen goes black. If it does, then please add the charger back, back up your files and run a factory reset on your phone.
Question edited for clarity.
Question moved to a better category.
Hello Maurice
questions like this really need to model number of model name. Doro make lots of flip phones. There are various ideas here in the links below.
Remove battery to reset.
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Hold the power and volume up and down buttons at the same time. A blue text screen should appear over the dead Android symbol. Select Reboot System Now using the volume up and down buttons to navigate your device and the power button to select.
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