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When laptop is started, the screen flickers violently with horizontal and vertical lines.   I then press the start button until laptop turned off...and then wait 10 to 15 seconds, switch back on and there is no problem from thereon.   Have used HP Diagnostics which said some drivers were missing so I ran that hoping that would solve the issue and saw a screen wich said No Issues. Unfortunately, the flickering screen when I first turn on the laptop still persists.   It's all a mystery! Please help. Thank you.

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