PC problem with Motherboard ports

Hello everyone,
I have problems with my pc.
First my external speakers, when I connect them to the integrated sound card, the right speaker makes strange noises, but when
I connect them with my TV they sound fine.
Then, there's something wrong with the USB ports because my mouse freezes for a second sometimes.
My motherboard is Gigabyte 946GMX-S2 and my power supply is Power Man 300W
My PC has 2GB RAM and Intel q6600 CPU.
If you can help, please do it 🙂
Thanks!
