Yesterday, i installed norton onto my family computer, which runs Windows SP3. I had already done this with my laptop(which I am having to use now), so I knew what to expect. I also decided to renew my subscription. At the time, everything worked, but within two hours my brother came and told me the speakers had stopped working. After a minute of tinkering with them, I got them to work again, but now in the control panel it says no audio device available. huh. ok. A few hours later, the same thing happened. I told my brother to reboot the computer, but by this time it was around 1 am, so he decided to just shut it down and go to bed. This morning, he woke me up, saying the computer wouldnt boot. I tried rebooting several times, including with alternate boot methods, and so far, nothing. Right after the initial boot screen, i get 3 system beeps, and windows doesn't even try to load. No splash screen, nothing. I can go to setup, and I can change boot device, otherwise, it just goes to a black screen. Also, the usb mouse stops working as soon as the initial boot screen goes away. Before yesterday, none of this was a problem. If anyone can give me some insight it would be greatly appreciated.