Given no make, model or details I'm going with the usual model and the cause is now well known. Sorry to read about your loss.
Windows Vista, AMD Athlon (tm) 64x2 DPC 4400+ 2.4 GHZ, System 32 bit, Explorer 9
This is a problem I addressed a few months ago, but may not have been able to explain
well enough to help solve the issue. I always turn my computer off every night (Desk-Top) and start
it up in the morning. At times it will start up and I have a black screen and notice the two lights on the
tower red and green. With black screen the red light is off while the green light stays on. I have to
shut it down by the power button restart . I'm ask to start up "normally" most of the time it will
stay on no problems. This is a reoccurring problem, so much so I'm surprised when I don't have to shut down
and restart the computer. Only once did I have to do this 3 times in a roll when it suddenly goes to black screen.
A couple of times I have had a screen looks like one of Vista's wall paper screens tells me to put in my
password and I don't know what password it needs, no way to exit so I have to restart by pushing the
power button. Restarts and the computer will be fine.
Any suggestion or help would be greatly appreciated,