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toshiba not booting

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On a laptop that won't boot, first thing would be to unplug/remove anything that can be removed. Battery, drives, memory, anything else plugged in. Sometimes a failed component can stop it from booting.

If possible, try a different external power supply as well.

If a laptop won't pass POST with all things removed, then there's not much more to do.

At that point it's either the motherboard, processor, or some issue like a display or backlight issue.