Why the red light is blinking
When I on my PC the red light start blinking
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Where on the PC is it blinking? Please provide a clear picture of where its blinking, if you can.
Is it blinking in any kind of pattern? If so, it's likely indicating an issue with the diagnostic LEDs, which can be translated here under "Diagnostic LEDs for the OptiPlex series (2005 to 2009)":
https://www.dell.com/support/kbdoc/en-us...
Good luck!
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