Dell Dimension XPS D Series, Reference And Troubleshooting Manual, Page: 69 / 191

Basic Troubleshooting 4-3
To check computer connections, follow these steps:
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Each of the serial, parallel, and USB interface cable connectors must be firmly
attached to an appropriate connector on the back of the computer as well as to
the interface connector on the device. The captive screws on the serial and paral-
lel interface cable connectors must be secure enough to ensure a firm
connection.
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A number of external factors, including temperature extremes and humidity, magnetic
influences, sources of electromagnetic interference (EMI), and poor input power or
signal quality, can interfere with the performance of your computer and attached
devices. Monitors are especially susceptible to these environmental factors. The
following items can adversely affect the performance of a computer system:
‡
Inadequate ventilation from operating the computer in a confined space, such as
a desk enclosure
‡
Direct sunlight causing the computer to overheat
‡
Line noise or power drops and surges from electrical outlets due to poor wiring
‡
Line noises or surges through telephone lines
‡
High-voltage electrical appliances on the same circuit or operating in close prox-
imity to the computer
‡
Speakers, subwoofer, or telephone too close to the monitor, generating magnetic
fields that distort the display image
‡
Fluorescent lights causing display flickering or distortion
‡
Extension cords
‡
Too many devices on a power strip or multiple power strips from one source
‡
Electrical conduits in an adjoining wall or elevators on the other side of the wall
If removing potential sources of problems does not help, try moving the system.