I have a refurbished Tosiba Tecra 8100 running Windows 2000, about five years old, that just stopped booting up. (Actually, I have twin computers- with the exact same problem!) I'll hit the power button and it seems to make an effort- but then there's a black screen and no activity. Oddly though, it will every once in a while make it to the login screen before freezing. When pressing the power button to shut it down, it either makes no noise or will beep one long, three short.
I didn't make an changes to the software nor the hardware before this, nor did it have any traumatic experiences. I tried replacing the RAM with no luck, and am at a loss as to what to do now.