Table A-2Diagnostic Front Panel LEDs and Audible Codes (continued)

Activity

Beeps

Possible Cause

Recommended Action

 

 

 

 

 

Red Power LED flashes four

4

Power failure (power

1.

Open the hood and ensure the 4 or 6-wire

times, once every second,

 

supply is overloaded).

 

power supply cable is seated into the

followed by a two second

 

OR

 

connector on the system board.

pause. Beeps stop after fifth

 

2.

Check if a device is causing the problem by

iteration but LEDs continue

 

The incorrect external

until problem is solved.

 

 

removing ALL attached devices (such as

 

 

power supply adapter is

 

hard, diskette, or optical drives, and

 

 

being used on the USDT.

 

expansion cards). Power on the system. If

 

 

 

 

the system enters the POST, then power off

 

 

 

 

and replace one device at a time and repeat

 

 

 

 

this procedure until failure occurs. Replace

 

 

 

 

the device that is causing the failure.

 

 

 

 

Continue adding devices one at a time to

 

 

 

 

ensure all devices are functioning properly.

 

 

 

3.

Replace the power supply.

 

 

 

4.

Replace the system board.

 

 

 

OR

 

 

 

 

The USDT power supply adapter must be at 135W

 

 

 

and use the Smart ID technology before the

 

 

 

system will power up. Replace the power supply

 

 

 

adapter with the HP-supplied USDT power supply

 

 

 

adapter.

 

 

 

 

Red Power LED flashes five

5

Pre-video memory error.

CAUTION: To avoid damage to the DIMMs or

times, once every second,

 

 

the system board, you must unplug the computer

followed by a two second

 

 

power cord before attempting to reseat, install, or

pause. Beeps stop after fifth

 

 

remove a DIMM module.

iteration but LEDs continue

 

 

1.

Reseat DIMMs.

until problem is solved.

 

 

 

 

 

2.

Replace DIMMs one at a time to isolate the

 

 

 

 

faulty module.

 

 

 

3.

Replace third-party memory with HP

 

 

 

 

memory.

 

 

 

4.

Replace the system board.

 

 

 

 

Red Power LED flashes six

6

Pre-video graphics error.

For systems with a graphics card:

times, once every second,

 

 

1.

Reseat the graphics card.

followed by a two second

 

 

pause. Beeps stop after fifth

 

 

2.

Replace the graphics card.

iteration but LEDs continue

 

 

until problem is solved.

 

 

3.

Replace the system board.

 

 

 

 

 

 

For systems with integrated graphics, replace the

 

 

 

system board.

 

 

 

 

Red Power LED flashes seven

7

System board failure

Replace the system board.

times, once every second,

 

(ROM detected failure

 

 

followed by a two second

 

prior to video).

 

 

pause. Beeps stop after fifth

 

 

 

 

iteration but LEDs continue until problem is solved.

58 Appendix A POST Error Messages

ENWW

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HP dc7900 manual Replace one device at a time and repeat
Page 63 Page 65

dc7900 specifications

The HP dc7900 is a well-regarded desktop solution that serves as a testament to HP's commitment to performance, reliability, and user accessibility. Introduced as part of HP’s Compaq line and designed primarily for business professionals, the dc7900 combines powerful processing capabilities with a compact form factor that suits various office environments.

One of the standout features of the HP dc7900 is its robust configuration options. It typically comes equipped with Intel's Core 2 Duo or Quad processors, giving users the ability to handle demanding applications seamlessly. The inclusion of Intel's technologies, such as Intel vPro, enhances remote management and IT control, making it an ideal choice for businesses looking to streamline their operations.

The dc7900 is designed with flexibility in mind. It offers multiple form factors, including mini-tower, small form factor, and ultra-slim desktop configurations. This variety enables organizations to choose a model that best fits their workspace requirements, maximizing both efficiency and aesthetics. The small footprint models are particularly beneficial in space-constrained environments, while the mini-tower version provides expandability for future upgrades.

In terms of graphics capabilities, the HP dc7900 typically features integrated Intel graphics, with options to install discrete graphics cards for users who require enhanced visual performance. This makes the dc7900 suitable for tasks ranging from standard office applications to more graphics-intensive responsibilities.

Connectivity is another key characteristic of the HP dc7900. It is equipped with a variety of ports, including USB 2.0 and audio jacks, allowing users to connect peripherals easily. Additionally, the dc7900 supports legacy connections, making it easier for businesses with older equipment to integrate new systems without hassle.

Durability and reliability are hallmarks of the HP dc7900. Built with high-quality materials and subjected to rigorous testing, this desktop is designed to withstand the demands of a bustling office environment. Furthermore, HP's comprehensive warranty and support options assure businesses of the reliability of their investment.

The HP dc7900 is not just a powerful desktop; it’s a versatile and dependable solution for modern businesses. With its combination of performance, expandability, and solid build quality, the dc7900 remains a relevant choice for those looking to enhance their productivity and efficiency in the workplace.
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