@bluesoul wall try to access the maintenance menu by holding [Doc][Enter][EE] and pressing the reset button on the back. In the maintenance menu, try 2 (erase OS).
If the problem persists, try 4 (full format - all data will be lost).
If it's not enough, another try with 2 and 4 usually completes the cleaning and solves the problem.
If nothing else you could try to access the diagnostics by holding [Esc][-][Menu] and pressing the reset button, then check for the options listed in there. Let us know what you got.
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