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There are many potential causes.

It may be due to power-saving settings or features on the computer.

It could be a failing monitor or monitor cable, or a loose cable.

It could be caused by a failing or loose videocard.

If there are other problems, such as the computer losing power during these 'black out', refusing to reboot, or other errors, there could be a hardware problem with the computers internals, such as a failing power supply, CPU, motherboard, or RAM.

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15y ago

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