When sitting, make sure the weight of your legs is on your feet and not on the front of your chair seat. Adjust your chair’s height or use a footrest, if necessary, to maintain proper posture.

Vary your work activities. Try to organize your work so that you do not have to type for extended periods of time. When you stop typing, try to do things that use both hands.

monitor screen at or below eye level

wrists relaxed and flat

monitor and keyboard positioned directly

in front of user

arms at desk level

feet flat on the floor

When Working Inside Your Computer

Before you remove the computer cover, perform the following steps in the sequence indicated.

NOTICE: Do not attempt to service the computer system yourself, except as explained in this guide and elsewhere in Dell documentation. Always follow installation and service instructions closely.

1.Turn off your computer and all devices.

2.Ground yourself by touching an unpainted metal surface at the back of the com- puter before touching anything inside your computer.

While you work, periodically touch an unpainted metal surface on the computer to dissipate any static electricity that might harm internal components.

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Dell 900 manual When Working Inside Your Computer