When you start the diagnostics, the Dell logo screen appears, followed by a message telling you that the diagnostics is loading. After the diagnostics loads, the Diagnostics Menu appears.

To select an option from this menu, highlight the option and press , or press the key that corresponds to the highlighted letter in the option you choose.

Regulatory Notices

Electromagnetic Interference (EMI) is any signal or emission, radiated in free space or conducted along power or signal leads, that endangers the functioning of a radio navigation or other safety service or seriously degrades, obstructs, or repeatedly interrupts a licensed radio communications service. Radio communications services include but are not limited to AM/FM commercial broadcast, television, cellular services, radar, air-traffic control, pager, and Personal Communication Services (PCS). These licensed services, along with unintentional radiators such as digital devices, including computers, contribute to the electromagnetic environment.

Electromagnetic Compatibility (EMC) is the ability of items of electronic equipment to function properly together in the electronic environment. While this computer has been designed and determined to be compliant with regulatory agency limits for EMI, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause interference with radio communications services, which can be determined by turning the equipment off and on, you are encouraged to try to correct the interference by one or more of the following measures:

•Reorient the receiving antenna.

•Relocate the computer with respect to the receiver.

•Move the computer away from the receiver.

•Plug the computer into a different outlet so that the computer and the receiver are on different branch circuits.

If necessary, consult a Dell Technical Support representative or an experienced radio/television technician for additional suggestions.

For additional regulatory information, see “Regulatory Notices” in the Appendix of your online User’s Guide. The sections specific to each regulatory agency provide country- specific EMC/EMI or product safety information.

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Dell C840 manual Regulatory Notices
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C840 specifications

The Dell C840, released in the early 2000s, was a powerful mobile workstation designed to meet the needs of professionals who demanded high performance in a portable format. As part of Dell's Precision series, the C840 was well-regarded for its robust build quality, advanced features, and capability to handle intensive computing tasks.

One of the standout features of the Dell C840 was its Intel Pentium 4 processor, which offered impressive processing power at the time. Users could opt between different configurations, some even including the Intel Pentium 4 Extreme Edition for those seeking maximum performance. The system was designed to handle demanding applications such as CAD, 3D modeling, and other graphics-intensive programs, making it a favorite among architects, engineers, and graphic designers.

The C840 also featured a vibrant 15-inch display, with options for a high-resolution screen that provided sharp visuals and ample screen real estate for multitasking. The display's quality was complemented by NVIDIA graphics options, including the Quadro4 700 Go graphics card, which was optimized for professional applications, ensuring smoother graphics rendering and improved performance in 3D applications.

In terms of memory, the Dell C840 supported a generous amount of RAM, with configurations allowing up to 2GB, which was substantial for its time. This memory capacity contributed to better multitasking capabilities and overall system performance, allowing users to run multiple applications simultaneously without noticeable slowdowns.

Connectivity was another strong point of the Dell C840. The laptop featured a variety of ports, including USB ports, parallel and serial ports, and an optional docking station, which enhanced its versatility for connecting to various peripherals. Wireless technology was also a part of the package, with the inclusion of Wi-Fi capabilities, making it easier for users to stay connected in different environments.

Durability and design were key aspects as well. The C840 featured a solid chassis designed to withstand the rigors of mobility, making it suitable for on-the-go professionals. Its keyboard was designed for comfort and responsiveness, a critical feature for users who spent long hours typing.

In summary, the Dell C840 was a notable mobile workstation that combined power, performance, and portability. With its advanced Intel processors, high-quality display, robust graphics options, ample memory, and strong connectivity features, it catered to professionals looking for a reliable and efficient tool to handle their demanding workloads. Though technology has evolved significantly since its release, the Dell C840 remains a milestone in the history of mobile computing for professionals.
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