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Do not double post, please, it makes it very hard for us to follow what has been already answered. Thank you.
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That seems like a video signal issue, for sure, so try another HDMI cable if you can, and/or see the RPI forums for what settings you need to have in config for your monitor setup.
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Just in case that is a RPI3 and you are using the "composite" analog output, see what your monitor can accept, be it PAL or SECAM or NTSC.