The camera and flash are part of the same flex cable that houses the power button and volume buttons. A cable can be "knicked" during repair and easily make one or two things fail. First, you want to locate that comnection using your "Ifixit" guide, and make sure its still properly seated. Once reseated, (make sure your battery is disconnected) hold the power button in to full disharge the device. Reseat your battery and retest all. If you still experiencing issuses then your flex cable may need to be replaced. Depending on how deep you've gone into a phone you may want to consult a professional, however if you're comfortable with the device, and are using proper grounding techniques it's not a very complex repair. Just keep refering to your guide constantly, and keep your screws organized! Happy fixing!
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