Motherboard integrated audio device missing randomly after turning on the computer.

Hello

Old location:

I recently changed my laptop Elitebook 2540p motherboard. When I installed windows 7 Enterprise 64-bit on my computer the computer lists not all audio devices in the Device Manager page. I checked the bios for all faulty settings and they are all good. Theres no yellow mark in the list of devices is and all the drivers appear to be installed.

New location:

Installed windows 7 and computer again found / installed normally audio devices. I tested computer for hours to read the audio data from it and everything worked well. I restarted computer several times / re installed the battery on the computer. A reboot the computers audio button mute fast under the screen seems to be orange and the speaker sound in windows icon has been marked as X I have check the list of devices in Device Manager and there is no audio device listed (no sound device at all). Once I restarted computer and before the computer started downloading windows I pressed the mute button and it turned blue. Then I went to windows and audio devices / audio devices has been registered and work / sound working again.

Old location:

I have motherboard integrated IDT audio device.

When I try to install audio drivers from hp for 2540p site I get "your system does not have the minimum requirements for this patch." And the Device Manager does not list all IDT audio devices.

I then installed xp, computer peripheral audio IDT normally found and sounds work properly.

New location:

After I made the new windows 7 install and all my audio drivers installed / devices showed in the list of devices / audio worked / I downloaded sound drivers driver HP site and install them to the computer.

Audio problems has not appeared again after my screen mute button HP turned to orange / speaker Windows sound was marked as X / computer didn t found no audio device.

Currently waiting if the problem happens again and try to think what would cause this (hardware or software problem)? And how to solve this problem permanently.

UPDATE: I have fully charged battery / computer was off while what to do and the problem came back. Mute button fast turned to orange. No audio devices and speakers marked as x. "No audio device installed".

I then installed USB headset and the computer recognizes the and the sounds are use of usb device. Theres still no IDT audio device, shown in Device Manager. Only usb headset work.

Any help for this problem?

-BIOS is updated to the latest version of the HP driver download center.

-All windows drivers are installed.

-Bios configured correctly.

-Reassembled the motherboard and tested all the cables are correctly placed.

EliteBook 2540p

Windows 7 Enterprise 64-bit

Motherboard Info: VB841AV product number

Product model BU RCTO i7-640LM Mfdf 2540p

598762-001 MB SYS W/PROC CORE 2 DUO 2.13 GHZ

P.S. This thread was moved from the company - Compaq, Elite, Pro for laptop - PC Compaq HP ProBook, EliteBook, slate/Tablet PC, Armada, LTE. -Hp moderator of the Forum

After change of motherboard second the audio computer´s worked well and the audio devices never disappeared from the computer. The first new motherboad that I had and I changed had broken the IDT audio chip.

Tags: Notebooks

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