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It is emi from inside your computer I'm afraid. It becomes more noticable at high volumes and especially when using headphones or a high quality external amp.
As has been mentioned a way to solve it partly would be to move your soundcard (if not using onboard) to a less crowded pci slot. Of course if you are using onboard sound a specific sound card would help significantly.
Unfortunatly for you wingless your only option is onboard sound using the outputs on your laptop. The only solution I can recommend would be to buy an external sound card running off USB or possible firewire. This will all but eliminate the emi with a minor reduction in sound performance and a higher use of CPU cycles. Of course this is also an option for a desktop user but an internal solution would be preferable especially if you play games or take your sound seriously.
Creative sell cards which might be able to help these include the extigy (USB) and an audigy 2 (pci) both are more games orientated but will provide excellent stereo playback too.
Hope that helps a bit.
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