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There are several different lights on a typical motherboard, each meaning different things. Different colors also usually indicate different types of status (e.g. green informational, red problems). If you can get the manual for that motherboard there will be a list identifying the meaning of each LED.

Most likely an LED that you have never seen light up when the machine worked but now lights up is indicating a low level hardware failure that prevents operation.

I have a desktop computer that has 7 or 8 LEDs on its motherboard, although all of them are red LEDs the manual identifies all but one as informational status lights, the remaining one which is slightly offset from the line of the others is identified as "fatal hardware error" and if it lights at any time the computer cannot operate in any way.

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8y ago

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