could you tell more about your 1640 history and current status ?

1. when did you buy it ?
2. how did you use it ? ( how many DVD did you burn ? )
3. . . .

Did you tried to re-install your OS, change a stable Power,

change IDE bus and adjust RAM timing in BOIS ?

I am surprised that you know so many black stories but you could
calm down and sometimes talked humorously !