Optimize content：Sometimes problems occur in macOS or computer components，as time goes by，they may gradually worsen，or suddenly。 Sometimes before these problems become major issues，Your Mac will send out warning signs 。You need to pay close attention to the operation of the system。We'll show you some common warning signs ，and discuss how to solve these problems in the following sections。 1.Mac无法打开 你按Mac上的电源按钮，nothing happened。No power light，no sound，And the screen is completely black。 don't panic，Just try the following steps to diagnose the problem： • Check power connection，Make sure both ends are secure。Next，检查电线...