I am facing no audio output for hp pavilion dv4000 laptop with windows 7 ultimate

SOURCE: sound device problem

The problem is the software driver that will make your sound device is not installed.install the device driver.this wiil cure the problem.

SOURCE: I want audio output drivers

First of all, let me tell you that the DV1000 series Notebooks are divided into two types..

One type is shipped with Conexant AC-Link Audio card and the other models are shipped with Conexant High Definition Audio card.

So, if your Notebook is shipped with AC-Link audio card, you will not be able to install the High Definit audio drivers and vice versa.

So, first, try downloading and installing the Conexant AC-Link Audio card Drivers for your Notebook from the link below :

ftp://ftp.hp.com/pub/softpaq/sp32001-32500/sp32272.exe

Save the file on the Desktop or My Documents folder and double click once the download is completed to installs the drivers.

However, if you are unable to install the above Drivers, we can come to a conclusion that the Notebook is installed with High Definition Audio and to install this drivers, we need to install the Microsoft Universal Audio Architecture(UAA) drivers before installing the Audio Drivers.

Download the Microsoft UAA Drivers for your Notebook from the link below :

ftp://ftp.hp.com/pub/softpaq/sp32501-33000/sp32646.exe

Save the file on the Desktop or My Documents folder and double click once the download is completed to installs the drivers.

Once the download and installation is completed, restart the Notebook and now, you can download and install the Conexant High Definition Audio drivers from the link below :

ftp://ftp.hp.com/pub/softpaq/sp32501-33000/sp32864.exe

Restart the Notebook and you should be able to use the notebook normally.

Hope this helps...

SOURCE: How to adjust the brightness on a HP Pavilion dv4000 laptop scree

Its usually the Fn key (bottom left) and a function key on the top line like F1 to F12 the brightness is the picture of the sun. I couldnt find any specific information on your model but most HP's are the same.

SOURCE: audio driver for hp pavilion ze2000

This Link
seems to provide the best thorough approach to getting those drivers installed & working.

However, someone claims, on this forum page(last post on the page) that all you need to do is use the "windows online driver search" function, and it will handle all of the messy work of locating, downloading & installing.

I hope that helps.

Testimonial: "this was a excellent fix thank you very much"

SOURCE: need to do a hard reset for hp pavilion dv4000

Hi, you can do a hard rest by following these steps:

Turn off the pc
Remove the cables and the battery on the laptop
Press & hold the power button for 5 seconds
Reinsert the battery and cables to it
Turn on the pc

that is how to do a hard reset....