Black screen Huawei G8

My Huawei G8 has a black screen and it doesn’t respond anymore when I hold the power button it shuts down and then the indicator light turns blue. The same thing happens when I put in the power cord which first turns red as if it’s charging and after a few seconds then turns blue and I don’t know what else to do because my warrant is not valid anymore. Can someone help? Thanks in advance.

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