Symptoms of stress and fatigue from working at a computer can be avoided with proper posture, good work habits and ensuring the equipment you work on is adjusted correctly.
To maximize your personal comfort:
Sit up with chair tilted back slightly.
Keep your head upright, facing forward.
Your thighs should be approximately parallel to the floor.
Relax your shoulders.
Keep your feet flat on the floor or on a footrest.
Your back should be firmly supported.
Your arms should rest lightly on the armrests of the chair.
Your wrists should be straight, flat and not bent backwards.
Look back here for further tips on how to keep your equipment adjusted properly!!