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I have tried a force reboot but my iphone 4 still doesn’t someone please help me

The LCD may be bad. Have you tried a new screen or “tester” screen?

Is this after a screen replacement the touch didn’t work, or did it just stop working the original screen? If it just stopped working, then you will probably need a screen replacement.

sounds like a bad digitizer consider replacing or invest that money towards a newer iphone

Replace the screen.do not try it yourself if you are beginner.iphone 4 screen replacement need some set of skill to replace.