Dell Precision Workstation with unusual crashing events

[*Xx~Vlad~xX*]

Have you tried: c:\>chkdsk /f from the command prompt to see if there are any bad blocks that the Dell Diag didn't catch? I have seen systems do this when the OS tires to page to a sector on disk w/ a bad block or two. Sometimes it would simply shutdown or BSOD while simply opening an application, or saving a txt file.

I wonder if a Ghost of the old drive onto a new drive would work (being that Ghosting might present a challenge w/ SCSI HD's) I have never tried ghost w/ SCSI drives before, just SATA/EIDE.

Also sounds like a short somewhere on the system board or the Power Supply not dishing out the right amount of AC to the system board.