Lenovo ThinkPad E550 (English) Hardware Maintenance Manual - ThinkPad E550, E5 - Page 56
Indicator, Description, Blinksforthreetimes, Blinks slowly, Blinks fast, Fn Lock indicator
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Table 7. Status indicators (continued) Indicator Description 4 and 6 System-status indicators Blinks for three times: The computer is initially connected to power. On: The computer is on (in normal mode). Off: The computer is off or in hibernation mode. Blinks slowly: The computer is in sleep mode. 5 Fn Lock indicator Blinks fast: The computer is entering hibernation mode. On: The Fn Lock function is enabled. To initiate the special function of each key, press the Fn key and the corresponding function key. To input F1-F12, press the function keys directly. Off: The Fn Lock function is disabled. To initiate the special function of each key, press the function keys directly. To input F1-F12, press the Fn key and the corresponding function key. 50 Hardware Maintenance Manual
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