Sony VGC-LS20 - Manual (Page 64)

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Using Your VAIO Computer
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Some devices may not function properly if you continually switch to Normal mode from Sleep mode. For some PC Cards, if you alternate between
Normal mode and Sleep mode while the card is inserted, you may find that a device connected to your system is not recognized. Restart your system
to correct the problem. Restarting will restore the original state of your computer.
Make sure you use the most recent software driver provided by the PC Card manufacturer.
Do not force a PC Card into the slot. It may damage the connector pins. If you have difficulty inserting a PC Card, check that you are inserting the PC
Card in the correct direction. See the manual that came with your PC Card for more information.