Second battery or any other optional device installed in the media bay

Cables that connect external devices through the input/output (I/O) connectors and ports on the computer.

Environmental Factors

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:

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 proximity to the computer

Speakers, especially subwoofer, or telephone too close to the monitor, generating magnetic fields that distort the display image

Fluorescent lights causing display flickering or distortion

Electrical extension cords and keyboard and mouse extension cables

Too many devices on a power strip or multiple power strips from one electrical outlet

Electrical conduits in an adjoining wall or elevators on the other side of the wall

Large metal beams inside the wall behind the computer

If removing potential sources of problems does not help, try moving the computer.

Power

If you are experiencing problems with power to your computer, perform the following tasks:

Check the computer’s power indicator. When lit, the power indicator verifies that the power supply is operating.

If your computer is connected to a power strip, turn the power strip off and then on again.

Plug the computer directly into an electrical outlet, bypassing any power protection devices.

Plug a device, such as a lamp that you know works, into the electrical outlet to make sure the power source is okay.

support.dell.com

Basic Troubleshooting

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Dell 7500 manual Environmental Factors, Power