Member Avatar for Umm-e-Habiba

I have dell Optiplex GX620, I have installed windows 7 but it shows that no audio output device is installed. I even changed my sound card, but no use. I have visited many hardware shops as well to repair it but no one could find any problem.

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The problem reported by — Windows 7 showing “no audio output device is installed” with a red X — has been tackled correctly so far by , and . Below is a short, ordered checklist that fills gaps in the thread and narrows down whether this is a driver/OS issue or a hardware/connection fault.

Start with Windows-level checks (no extra downloads needed):

  • Open Device Manager (devmgmt.msc) and expand “Sound, video and game controllers.” Show hidden devices (View → Show hidden devices). Look for Unknown devices or yellow-exclamation entries.
  • In Control Panel → Sound (or mmsys.cpl), right‑click in Playback devices → Show Disabled Devices, enable the correct output and set it as Default.
  • Confirm services: open services.msc and make sure Windows Audio and Windows Audio Endpoint Builder are set to Automatic and Running.
  • Run an elevated command prompt and execute sfc /scannow to rule out corrupt system files.

Quick recovery steps if drivers look missing or broken:

  • In Device Manager uninstall the audio device(s) and check “Delete the driver software for this device,” reboot, then install the proper driver that matches Windows 7 and the system architecture (32/64-bit). Install chipset drivers before audio drivers to avoid bus/PCI recognition problems. If the device is not listed at all, use Action → Add legacy hardware → Sound, video and game controllers → High Definition Audio Device to force Windows to load a generic driver.

Hardware/connection isolation:

  • If a discrete PCI card is present, make sure the onboard audio is disabled (per /) or vice‑versa to avoid conflicts, test the card in another PCI slot, and confirm the speaker/headphone cable is into the right jack. Test speakers/headphones on a known-good device or try a cheap USB audio adapter — if USB audio works, the fault is on the motherboard/card side.

If these steps still show “no device,” the likely causes are a failed audio codec on the motherboard or a bad PCI card; at that point a known-good USB or PCI sound adapter is the fastest way to restore sound.

Recommended Answers

All 9 Replies

Member Avatar for JorgeM

I have a gx620 as well and have not seen any problems with XP or 7. Check to make sure the integrated sound is not disabled in the BIOS settings.

Member Avatar for caperjack

the tower should have a dell service tag # on it put it in the box in link and download drivers for the motherboard like chipset and video and sound .
if hands on computer repair people cound not fix it then there either don't know what they are doing or the computer broke beyond repair .adding another sound card should have fixed it as long as you installed drive fro the new card
http://www.dell.com/support/troubleshooting/us/en/04/TroubleShooting/ProductSelector

Edited by caperjack
Member Avatar for bobbyraw

the gx620 normally comes with a PCi card.was the old card ever working. one poster said to check the bios. you want to make sure the onboard is disabled.and enable the pci. if you still cannot get sound use another PCI slot (if you have one)alo make sure you are plugging into the speak/head phone slot on the PCI card. if the PCI card has a audio cable to connect to the moboo make that's connected too.

Member Avatar for Umm-e-Habiba

old card was working well few months ago, then I started using another system. now I installed new window on gx620 and started using it but no sound now.

Member Avatar for caperjack

new window on gx620 and started using it but no sound now.

the new windows install likely didn't install drivers for the sound devive ,so unless you install the correct driver for the sound its no going to work,and like i said in my other post ,Dell computers have a service tag on them go to the link in my other post and put in theservice # and it will take you to the correct driver for the computer

Edited by caperjack
Member Avatar for Umm-e-Habiba

I have intsalled the driver, but when I installed the skype it says no sound card found

Member Avatar for caperjack

I have intsalled the driver, but when I installed the skype it says no sound card found

so you sound works when you use it correct ,its just skype does,t reconize that the device is installed

Member Avatar for Umm-e-Habiba

no, there is always a cross on speaker sign in right bottom corner, I gave the example of skype for understanding

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