Lenovo ThinkCentre M90a Gen 3 User Manual page 8

11. Headset connector
13. Power button
15. Optical drive eject button*
* for selected models
System status indicator
Show the system status of your computer.
• 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.
Related topics
• "Use the optical drive (for selected models)" on page 14.
• "Use a media card (for selected models)" on page 15.
• "Lenovo diagnostic tools" on page 8.
• "USB specifications" on page 5.
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M90a Gen 3 and M90a Pro Gen3 User Guide
12. SD-card slot*
14. Optical drive activity indicator*