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Original post by: rdklinc ,

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I agree that this is most likely logic board failure, but just one note -- G4s often get shorted out by loose screws on the underside of the board, and produce the "fan on high" issue you're experiencing.  You might want to remove the lower shielding, and see if any screws underneath fall out, or if any of the screws connecting the board to the frame are visibly loose.  Then, try powering on with the lower shielding removed.

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