No sound from internal speakers

[HGAW_1]

I have installed the internal speakers in my HP Proone 440 G9 AIO 23.8, but the speaker doesn't sound. If I use the headphone jack there is sound. When i disconnect the Headphone jack there will be no possibility to change the volume, and no output device will be shown. Is there anyone able to solve the problem?

[Sophytaylor6]

This might be possible if the internal speaker cable is not connected. Also check if the BIOS audio is disabled.

Here are few fixes that you can try:

1. Check if the Internal Speaker Cable Is Properly Connected
2. Install HP Audio Drivers
3. Run Audio Troubleshooter

[HGAW_1]

English is not my native language, so ich will try to explain it otherwise. I have bought the HP 440 Proone G9 and have forgotten to order also the optional internal speakers. So i bought the speakers afterwards and put them in. The cable is proper connected, but there is no sound on the speakers, there is even no output device shown; not under Windows sound and not under the device manager. Has there some more work to be done as only to build in the internal speakers?