No Sound or System Sounds working

System Restore is a very useful tool. I do PC support and it has made me look like "super tech" many times.

First thought, go to the Device Manager, RIGHT click on the entry for your sound module (such as RealTek, IDT, Conexent or whatever you have) and then LEFT click "Uninstall". DO NOT check the box to also uninstall the drivers. Then restart the PC and when Windows starts it will detect and reinstall the sound. This will reset the sound module and any corrupted status in Windows.

If that does not fix it, there could be some type of hardware problem that is causing the sound module not to switch back to the speakers. If the PC is still under warranty, contact the Vendor as they are the only ones that can correct it under warranty. All in one's are basically a Laptop PC with a desktop monitor and keyboard/mouse and thus everything is on the motherboard.

Check the Control Panel/Hardware and Sound. Some sound devices have an audio manager (e.g. RealTek HD Audio Manager) that will allow reassigning jacks to different uses. e.g. the mic jack as the headphone jack, etc. If yours has this, there is a possibility that will fix it.

What is the PC you have?

That doesn't help. The Gateway model number is needed to check on what you have.

It may also be worth the support charge to contact Gateway and see if they can get it corrected.