Question about HP Compaq DC7900 PC Desktop

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How do i change the serial number on my hp dc7900 tower pc have just replaced the system board and want to change the serial number.

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Posted on Jan 02, 2017

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SOURCE: Somenon put a power on password on a hp desktop

Turn the unit off. If you open the unit there will be a jumper to clear the CMOS and a battery. Remove the battery and then switch the jumper as silkscreened on the board. usually there are 3 pins currently crossed are 1 and 2. switch it to 2 and 3, press the power button then hold for a few seconds. unpress the button and remove the pwoer cord. press and hold the power button again for a few seconds to clear all power. reconnect the jumper to 1 and 2. put battery in and plug and boot. password should be gone.

in some units there is a "clear password" or "cmos password" jumper. crossing this will remove the password in those units.

Posted on Feb 17, 2010

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SOURCE: I'm having a problem with HP DC7900 SFF. The Video

The amount of allocated shared video memory is configured in the BIOS configuration - video memory.

Posted on Jun 20, 2011

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My hp Compaq DC7900 has 5 beeps with 5 red light flashing does this 3 times. then the fan kicks on. That's all it does. Anyone know what this is?

This is a sign of a pre-video memory error. If your DC7900 has a video graphics card, that card has probably failed or doesn't have enough power. On at least some of HP's Compaq DC7900, the video card uses a PCIe x16 slot.

There are two things to consider when you choose a new video graphics card: 1) it must fit in a slot in your case and 2) your power supply must meet the requirements of the card. The small tower format of the HP Compaq DC7900 came with a 240W power supply. Most modern video graphics cards often need more power. You may need to upgrade the power supply.

I hope this helps.

Cindy Wells

Aug 13, 2014 | HP Compaq DC7900 Small Form Factor PC...

2 Answers

Microcode error dc 7900

You need to find out what motherboard it is. Then, see if that motherboard can handle that processor.

Jul 05, 2014 | HP Compaq DC7900 PC Desktop

1 Answer

Hp dc7900 powers up momentarily even when computer is off

Which devices can wake up your system? Check your bios.
Change what causes your problem.

Feb 24, 2014 | HP dc7900 PC Desktop

1 Answer

A6512p recovery disk


HP Support has them for F_R_E_E

The shipping and handling is not free.

In the USA, for a 5 to 7 day ship it's $17
For a 2 to 3 day ship it's $24.
Call 1-800-474-6836
24 hours a day, 7 days a week.

Have the Serial Number written down to give to the nice representative.
It's in the white Service Tag on the back of the computer tower, next to the Windows product key; or up on the side of the computer tower.
S/N = Serial Number

{DO NOT post a serial number on a public forum. Only give to an authorized HP representative }

Outside the USA use HP Worldwide Support,

For additional questions please post in a Comment.

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1 Answer

We have windows server 2003 system installed on HP dc7900 Small Form Factor. When we connect Segate Expansion Portable 1 TB drive with it, the drive is accessed in read only mode. Can any body help us in...

You may have to go into the properties of the drive itself to change it to read and write mode Go to My Computer tick on the drive select properties and select read and write. Allow files to be indexed as well. Unpick the read only selection.

Apr 10, 2012 | HP dc7900 Business Desktop Small Form...

1 Answer

HP Compaq DC7900 PC Desktop power password problems

please mention which operating system is being used or where you facing password problem????

Sep 10, 2011 | HP Compaq DC7900 PC Desktop

1 Answer

I'm having a problem with HP DC7900 SFF. The Video Card shared memory is 1GB. according to there technical paper maximum should be 384MB only. I'm using winxp sp3 with 2GB memory. How can i change...

The amount of allocated shared video memory is configured in the BIOS configuration.
Go into the BIOS - video memory to change the amount of video RAM..

Jun 20, 2011 | HP Compaq DC7900 PC Desktop

1 Answer

I'm having a problem with HP DC7900 SFF. The Video

The amount of allocated shared video memory is configured in the BIOS configuration - video memory.

Jun 20, 2011 | HP Compaq DC7900 Small Form Factor PC...

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