No, its more than likely a problem with software..
Hardware issues would have worst effects.
For instance, I've seen a motherboard where they plugged in a USB device and upon doing so (done incorrectly with force), shorted out the northbridge of the board breaking the circuitry of the bridges on the board.
First, try updating your chipset drivers if you haven't done so already from:
If that doesn't work, you can try flashing the BIOS of your SiS board, and see if it fixes the problem. Remember, flashing your BIOS is not the safest thing to do and I take no responsibility if your board becomes a wall piece (broken).
I wasn't able to find information on flashing the BIOS on the SiS website, but I'm sure you can contact Support about the issue if need be.
All the same, good luck.