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This sounds like the possibly infamous Nvidia GPU defect. It is caused by heat, over time the solder fractures and separates from the board. Typically the solution is either repair it (temporary fix) or get a new board and hope for the best.
Pressing the f8 key doesn't work either? This should boot the laptop to safe mode, if it doesn't then check the memory cards before you do anything else, try to get somebody with the same type of memory card to lend it to you. If that doesn't work, then your HDD is corrupted, and to re-install Windows.