Lenovo ThinkPad T21 English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 12
Do not touch the lens on the CD-ROM tray.
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Do not modify or tape the latches to keep the display open or closed. Do not turn your computer over while the ac adapter is plugged in. This could break the adapter plug. Do not move the computer when the hard disk drive is accessing data (when the indicator is blinking). Do not use or store your computer where the temperature is below 5° C or above 35° C (41° F and 95° F). Do not place your computer closer than 13 cm (5 in.) to any electrical appliance that generates a strong magnetic field, such as a motor, a magnet, a TV, a refrigerator, or large audio speakers. Do not put an operating cellular phone on the computer. The phone might cause malfunction in the computer system. Do not hard-mount your computer in a vehicle or anywhere that it is subject to strong vibration. Do not crush, drop, or physically punish the external or removable hard disk, diskette, or CD-ROM drive when it is outside your computer. Do not press on the middle part of the diskette drive or the CD-ROM drive. Do not insert a diskette at an angle. Not inserting the diskette straight into the drive can damage the drive. Do not attach more than one label to a diskette, and do not allow the label to be loose. Multiple or loose labels can detach or tear and then lodge in the drive. Do not touch the lens on the CD-ROM tray. Do not close the CD-ROM tray until you hear the CD-ROM click into the center pivot of the CD-ROM drive. Do not touch the surface of a compact disc; handle the compact disc only by its edges. Do not connect the modem to a PBX (private branch exchange) or other digital telephone extension line. Your computer can use only a public-switched telephone network (PSTN). The use of a phone line other than PSTN can damage your modem. If you are not sure which kind of phone line you are using, contact your telephone company. Many hotels or office buildings use digital telephone extension lines, so check before connecting the telephone cable in such places. Do not leave the base of your computer in contact with your lap or any part of your body for an extended period when the xii IBM ThinkPad T20 User's Reference