USB Sound Card and Onboard simaltaneous audio

How do I have both USB sound card and Onboard realtek speakers on at the same time?
I use a normal cheap usb sound card.
1.0x0.jpg


Problem is when I plug in the usb sound card in the front my headphones from back dont give any audio.
 
You can use two soundcards (I have with recording musical instruments) but you can't output both cards to the same set of speakers. If you have headphones (depending on your sound card's capabilities) you would have to set the sound card you want to use with your head phones to output to that device. If you have speakers, then you would have to set the other sound card to use the speakers. Normally that is done through the Playback settings in windows.(right click on your speaker icon and select it) Of course like I said, this will only work if your hardware supports it. Most cheap sound cards don't have that capability.

`
 


It didnt work, but thanks for suggesting it. I am using the headphones just like a usb storage (plug n play), when i connect speakers are disabled and when I remove it speakers are enebled. But will constant disabling and enabling harm the sound card of my mobo?