Samsung S7 wont turn on and only when pwr is applied will it give any indication of life. After I have applied pwr it comes up with flashing blue in the upper left corner and says Rebooting ?????. I have pushed the pwr+volupkey. And pwr+volupkey+hickey and nothing happened. The only response I get is when I hold the voldwnkey+pwrkey and it wants to install new software.