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By the single line I assume you mean the green line out cable and you have connected this to the sound connector on the monitor, so that you have the Dell computer using the monitor speakers?
The problem may be down to the sound chip on the Dell conflicting with Creative labs speakers, it may not support the 7:1 sound. You can try updating the Dell sound drivers, however Given the problem, I'd invest in a pci soundcard and hook the speakers up to that, or look at an external soundcard
2 things are needed to get sound from your speakers:
1-wiring connecting your speakers to a socket to the back of the computer. (The spot they need to plug in to ON YOUR COMPUTER is a small light green circular socket. The other end of the plug you plug in here should run to one of your speakers *usually the right side speaker-the right speaker should then have separate wiring to connect the left speaker.)
2- A source of power.
Some speakers use their own power source and plug in to a power outlet - your wall. Other types have a USB type plug and plug into a USB port in your computer and that is how THOSE get their power.
Those are the basics of sound setup. Some computers are equipped with more complicated setups such as surround sound, subwoofers, digital and more. Reply if you need more help, I will try to assist you further.
make sure the power is hooked to the back of the monitor, and that the speakers are hooked into it. make sure it is switched on and volume is at 50% or higher. if it still doesnt work, try hooking an mp3 player to the speaker jack. if they work, its the computer. if it doesnt work, replace the speakers.
sound form your projector? or from your speakers? set the volume of your projector to maximum. then check your connection cables if good your speakers if working. check all your component have pwoer supply.
The speakers are not the sound device, the sound card is. You ust select the sound device that is installed in the computer. If you PC is a Dell, go to Support.dell.com and enter your service tag in the downloads section. download the latest audio driver for your PC and it should reset everything to the correct parameters.
It should be having onboard sound card, check from Bio's setup whether the Audio is ON. also check in control panel sound and media devices and check the volume maybe it's very very low or on mute. Also try with other speakers