Diagnostic Lights

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.

To help troubleshoot a problem, your computer has four lights labeled 1, 2, 3, and 4 on the front panel (see "Front View" on page 13). When the computer starts normally, the lights flash before turning off. If the computer malfunctions, the sequence of the lights help to identify the problem.

NOTE: After the computer completes POST, all four lights turn off before booting to the operating system.

Light Pattern

Problem Description

Suggested Resolution

The computer is in a normal off condition or a possible pre-BIOS failure has occurred.

The diagnostic lights are not lit after the system successfully boots to the operating system.

•Plug the computer into a working electrical outlet (see "Power Problems" on page 61).

•If the problem persists, contact Dell (see

"Contacting Dell" on page 179).

A possible processor failure has occurred.	• Reseat the processor (see "Processor" on
	page 129).
	• If the problem persists, contact Dell (see
	"Contacting Dell" on page 179).

Memory modules are detected, but a memory	• If two or more memory modules are
failure has occurred.	installed, remove the modules (see
	"Removing Memory" on page 93), then
	reinstall one module (see "Installing
	Memory" on page 92) and restart the
	computer. If the computer starts normally,
	continue to install additional memory
	modules (one at a time) until you have
	identified a faulty module or reinstalled all
	modules without error.
	• If available, install working memory of the
	same type into your computer (see
	"Installing Memory" on page 92).
	• If the problem persists, contact Dell (see
	"Contacting Dell" on page 179).

A possible graphics card failure has occurred.	• Reseat any installed graphics cards (see
	"Cards" on page 94).
	• If available, install a working graphics card
	into your computer.
	• If the problem persists, contact Dell (see
	"Contacting Dell" on page 179).

Troubleshooting

XPS 720, 720 specifications

The Dell XPS 720 is a powerful desktop computer that epitomizes the brand's commitment to performance and innovation. Introduced as part of the XPS (Extreme Performance System) line, the XPS 720 was designed for gamers, content creators, and tech enthusiasts who demand high performance from their machines.

One of the standout features of the XPS 720 is its impressive processing capabilities. The system can be equipped with Intel's quad-core processors, notably the Intel Core 2 Quad, which allows for exceptional multitasking and enhanced performance in multi-threaded applications. This makes it suitable for gaming, video editing, and graphic design.

The XPS 720 also offers a high level of customization, giving users the ability to select their desired specifications. Customers can choose between various configurations of RAM, hard drives, and graphics cards. The XPS 720 supports multi-GPU setups with NVIDIA’s SLI technology, enabling gamers to run the latest titles at optimal settings and resolutions, while also improving performance in demanding applications.

In terms of graphics capabilities, the XPS 720 can be outfitted with powerful NVIDIA GeForce or ATI Radeon graphics cards. This feature makes it a strong candidate for users who require cutting-edge visual performance, whether it’s for gaming, immersive simulations, or graphic-intensive applications.

Cooling solutions are a critical component of the XPS 720’s design, as high-performance systems generate substantial heat. Dell incorporates an advanced cooling system that includes unique thermal management technology to maintain optimal temperatures during heavy use, thereby prolonging the life and performance of the internal components.

The chassis of the XPS 720 is not only aesthetically pleasing but also functional. It features a sleek, futuristic design with customizable LED lighting, providing a visually appealing experience. The case also allows for easy upgrades and maintenance, which is essential for users who wish to enhance their systems over time.

Connectivity options are abundant on the XPS 720, with multiple USB ports, audio jacks, and high-definition multimedia interfaces. The inclusion of high-speed Ethernet and optional Wi-Fi capabilities ensures that users can stay connected whether for online gaming or browsing the web.

Overall, the Dell XPS 720 stands out as a commendable desktop solution that combines raw power, flexibility, and cutting-edge technologies. It remains a favorite among those looking for a robust machine capable of handling a wide variety of demanding tasks, from gaming to professional creative work. Whether you are a hardcore gamer or a professional seeking performance, the XPS 720 offers an exceptional computing experience.

Dell XPS 720 owner manual Diagnostic Lights

Models: XPS 720 720