Ah this is so sad! 
@Caroline269834 Caroline do you still have all your code?
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Thankfully I do! 
I backed everything up on my laptop every time I added something new so PHEEW hahaha I already have a new Pi on the way.
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Oh man, how unfortunate. I was a little hopeful but thank you so much for the input!
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The new Raspberry Pi is acting the same way as my first one 
I changed the power cable, used my laptop charging cable and everything was working perfectly well. I unplugged it before going to work and now its acting up, it’s flickering again and I’m unable to do much. Would the HDMI cable be the problem then? I don’t understand
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Oh, I didn’t notice this on the original image but those might be scan lines.
Do you have another computer you trust you could plug into that monitor as an experiment?
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Yes!! I connected my laptop to the monitor and it’s been working great.
-edit: I also tried connecting it to my tv and the red lines don’t show up but it doesn’t load either
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Are you using the same SD card on both your old and new Raspberry Pi?
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Nope 
