Diagnostic Lights

4-4-2	Failure to decompress code to shadowed memory
4-4-3	Math-coprocessor test failure
4-4-4	Cache test failure

To help troubleshoot a problem, your computer has four lights labeled 1, 2, 3, and 4 on the bank panel. 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

apossible pre-BIOS failure has occurred.

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

A possible processor failure has occurred.

Memory modules are detected, but a memory failure has occurred.

Plug the computer into a working electrical outlet.

If the problem persists, contact Dell.

Reseat the processor (see Processor information for your computer). If the problem persists, contact Dell.

If two or more memory modules are installed, remove the modules, then reinstall one module 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.

If the problem persists, contact Dell.

A possible graphics card failure has occurred.

A possible floppy drive or hard drive failure has occurred.

Reseat any installed graphics cards.

If available, install a working graphics card into your computer. If the problem persists, contact Dell .

Reseat all power and data cables.

A possible USB failure	Reinstall all USB devices and check all cable connections.
has occurred.
No memory modules	If two or more memory modules are installed, remove the modules,
are detected.	then reinstall one module 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.
	If the problem persists, contact Dell.
Memory modules are	Ensure that no special requirements for memory module/connector
detected, but a	placement exist.
memory configuration	Ensure that the memory you are using is supported by your computer
or compatibility error	(see the "Specifications" section for your computer).
has occurred.	If the problem persists, contact Dell.
A possible expansion	Determine if a conflict exists by removing an expansion card (not a
card failure has	graphics card) and restarting the computer.
occurred.	If the problem persists, reinstall the card you removed, then remove
	a different card and restart the computer.

780 specifications

The Dell OptiPlex 780 is a versatile desktop computer that stands out for its reliability, performance, and energy efficiency, making it an ideal choice for businesses and individuals alike. Launched as part of Dell's OptiPlex series, the 780 caters to a wide range of computing needs, from basic office tasks to more demanding applications.

One of the most notable features of the Dell 780 is its powerful performance. It is equipped with Intel's Core 2 Duo processors, which deliver reliable multitasking capability and responsiveness. With options for up to 8GB of DDR3 RAM, users can expect smooth operation when running various applications simultaneously. This makes the OptiPlex 780 suitable for environments where productivity is essential.

In terms of connectivity, the Dell 780 is built with a variety of ports, including USB 2.0 and USB 3.0, ensuring compatibility with numerous peripherals and devices. Additionally, it offers audio jacks, a serial port, and VGA, DisplayPort, or DVI outputs, allowing users to connect to multiple displays or integrate with legacy systems.

The Dell 780 incorporates several technologies focused on security and management, making it a reliable choice for businesses. The built-in Trusted Platform Module (TPM) enhances data protection by enabling hardware-based encryption, while the chassis lock feature provides physical security against unauthorized access. Furthermore, with remote management capabilities, IT administrators can efficiently monitor and maintain the system, reducing downtime and simplifying support tasks.

Energy efficiency is another key characteristic of the Dell OptiPlex 780. It is designed to meet Energy Star certification requirements, which signifies that it consumes less power compared to traditional desktop computers. This not only contributes to lower utility bills but also aligns with environmentally responsible practices, making it a compelling option for organizations aiming to reduce their carbon footprint.

The unit’s compact design and choice of form factors—mini-tower, desktop, and small form factor—allow it to fit seamlessly into various office environments. The easy-to-access internal components further facilitate upgrades and maintenance, providing flexibility for future enhancements.

Overall, the Dell OptiPlex 780 combines robust performance, extensive connectivity options, advanced security features, and energy efficiency, making it an exceptional choice for a diverse range of users. Whether in a corporate setting or at home, it continues to deliver dependable performance that meets the demands of modern computing.