Well, the power went out in my mother's house while my sister was on the computer. So, my mother goes and flips the circuit breaker, and my sister goes back on. Then, my mother flips the circuit breaker again. Instead of saying anything, my sister flips the computer back on and my mother hits the circuit breaker again. So, now, here's the error she says she gets... You turn on the power and there's a black screen saying "Time and Date Invalid" Blah, blah, blah. Press F1 to boot. It gets to the Windows XP screen where the little bar is loading, and hangs. The bar still fills up, but it just keeps filling up forever. I tried starting with last known good configuration... nothing. I tried starting in safe mode, it gets past the loading screen and then turns black with the "MICROSOFT WINDOWS XP SAFE MODE" written on top in white. Mouse responds, but it hangs there. Is something cooked inside? could it be the tiny lithium battery which keeps the clock running?