I have a Dell 690 workstation fitted with two quad core E5320 processors. I have had trouble with this PC possibly due it being damaged in delivery - it weighs 30 or so Kg. Perhaps I should have returned it :( Too late now. After using it and updating etc I gave it to my daughter and did a Windows Easy Transfer (WET) to replace her aging Dell. Apparently, the Outlook Profile was corrupted and then there was an unidentified hardware issue that prevented the 690 PC from booting. I replaced the PC with another 690 that has been fine. However, I am currently trying to sort the issue out. It seems that I have made progress but since the 690 has two quad core CPUs fitted I thought that it would be prudent to update the BIOS from A01 to A08 this was completed successfully. But now I have an incompatible processor system Halt! message. Added complexity, after the BIOS update the DOS white on black text was fuzzy suggesting a graphics card issue? This info may be irrelevant.
I am wondering whether the original hardware issue that prevented the PC from booting up was due to one or the other processor(s) failing or malfunctioning.
Footnote: I have bought and installed about 15 Dell PCs both new and second hand and have had no hardware issues apart from a broken CPU fan clip! Any problems have been due to software. I have had my first hard drive failure, fortunately in a RAID mirror. and I have owned computers dating back to 1984 or when the hard drive was invented. My MPhil thesis was stored on Sinclair Microdrives, one for each chapter, and I was using a 128 Sinclair Spectrum!