Hi,
If the demo works, then your Virus probably works fine, but is not configured.
What OS do you have on it? Depending on the OS, you might be able to audition sounds directly by pressing the two buttons above the LCD screen together. If you cannot hear sound, it could be because the patch/multi you're trying to listen to has it its outputs routed to matrix or some other location.
You can update the OS to V2.8 maximum, which is worth doing if its not already loaded. Download the OS from the Access Virus website (in the support->downloads section). Its a bit of a learning curve to update the OS, but its worth doing because you'll learn a lot.
For performing a factory reset, do this: Hold the keys LFO 1 SHAPE and LFO 2 SHAPE while switching the VIRUS on.
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