Lenovo ThinkCentre M90a Pro Gen4 Hardware Maintenance Manual page 36

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11. USB 3.2 connectors Gen 2
13. Headset connector
15. Power button
17. Optical drive eject button*
* for selected models
System status indicator
Show the system status of your computer.
Thunderbolt 3 connector
For the use of this connector, see "Thunderbolt 3 connector" on User Guide.
• Blinking for three times: The computer is initially connected to power.
• On: The computer is starting up or working.
• Off: The computer is off or in hibernation mode.
• Blinking rapidly: The computer is entering sleep or hibernation mode.
• Blinking slowly: The computer is in sleep mode.
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M90a Pro Gen4 Hardware Maintenance Manual
12. Thunderbolt 3 connector*
14. SD-card slot*
16. Optical drive activity indicator*

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