I purchased this computer Saturday. Saturday it crashed, Sunday it crashed, and today (Monday) it crashed. Saturday, I was just routinely surfing the internet and, without any error messages, the computer completely shut down. I tried hitting the power button to turn it back on and it did not respond (almost as if it were unplugged).
I unplugged the computer from the wall socket and waited a few seconds before I plugged it back in ... nothing. I repeated this about five times and finally the power button worked and the computer came back on.
The same thing happened both Sunday and today, except that, in each of these instances, I was listening to iTunes when the shut down happened.
I did the online chat with a Dell representative. His first idea was that the computer was overheating. I told him it is not in a congested area and my previous computer (a Gateway that NEVER crashed, not even once, in SEVEN years)had been set up in the exact same spot and had never overheated. His second idea was that I was an idiot and had neglected to remove "packaging" from the tower. I double-checked, just to make sure, and there was no left over material on the tower.
Finally, he did the whole "remote takeover" of my computer. He downloaded some type of driver and told me to shut down the computer, restart, and let it run in System BIOS mode for 2 hours. He said if the computer did not shut down during BIOS mode, then the problem existed within the OS (something wrong with Vista? Major surprise!). Of course, the computer did not shut down in BIOS mode and worked just fine the rest of Sunday night. Then today, boom! It shuts down again.