The reply is even more interesting . This is by an official rep. Really impressed by Dell.

"As mentioned above, no biological hazard was involved and we do know that a manufacturing process was the root cause. That process was changed which resolved the issue on newly manufactured units. As for everyone out there with a unit that still exhibits the symptoms, we haven't forgotten about you and will make things right. Keep watching this thread and as soon as more info if available, we'll let everyone know."