Could you please help me with my pc powering on and off.

[Harvey Robinson]

I tried booting into safe mode after changing screen resolution. Now my pc is turning on and off, it turns on for 5 seconds then turns off, after that it turns on again for 20 seconds. When it's on for 20 second there is a little white line in the top left corner then it turns of and repeats it. Hoping you can help me.

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