If your fans come on full blast during startup, and don’t settle down, check systematically through these causes to discover what is wrong. Careful cleaning is vital to ensure effective cooling from the fans. Air ducts, grilles, etc., are choked with dirt and debris.Restarting your Mac normally restores full function. Core Duet has failed and can’t restart.This in turn can occur because of a bug in the SMC firmware. The SMC needs to be reset, usually because of a software glitch.A common reason for failure is damage when a user attempts to repair or upgrade their Mac. Unfortunately, as these are often embedded in hardware components, replacement may require a complete exchange logic board, or similar. Among the common reasons for failure are:
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