Lenovo ThinkPad X23 ThinkPad X20, X21, X22, X23, X24 Hardware Maintenance Manu - Page 51
Fn key combinations, The following table shows the function of each combination - ibm memory
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Memory Fan 1. If two DIMMs are installed, remove one of them and run Diagnostics --> Memory Test - Quick. 2. If the problem does not recur, replace the DIMM, remove the other one, and run the test again. 3. If the test does not detect the error, run Diagnostics --> Memory Test - Full. 1. Turn on the computer and check the air turbulence at the louver near the power switch. 2. Run Diagnostics --> Other Devices --> IBM Fan. Fn key combinations The following table shows the function of each combination of Fn with a function key. The Fn key works independently from the operating system. Key Combination Result Fn + F1 Reserved. Fn + F2 Reserved. Fn + F3 Standby mode. Fn + F4 Suspend mode. Fn + F5 Reserved. Fn + F6 Reserved. Fn + F7 Switch between the LCD, the external monitor, and both the LCD and external monitor. Fn + F8 Reserved. Fn + F9 Reserved. Fn + F12 Hibernation mode. Fn + PgUp ThinkLight On/Off. Fn + Home The LCD becomes brighter. Fn + End The LCD becomes less bright. Chapter 3. ThinkPad X20, X21, X22, X23, X24 47