Sony VGC-LT10E User Manual page 73

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Using Your VAIO Computer
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Some devices may not function properly if you continuously 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 the device connected to your system through the PC card is not recognized.
Restart your system to correct the problem.
Make sure you use the latest 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.