Boot Error message "Checkpoint D0"

When I start up my xps 435mt right after the Dell Splash Screen I get the following message:

"Alert previous attempts boot this sytem have failed at checkpoint D0"

Working with Dell we have replaced the motherboard and hard drive and updated the BIOS.

Two days latter i Received the message again. I now have the Tech coming back with the following items: Motherboard, Memory Chips and new Video Card.

Has anyone have this problem?

Can someone tell me what Checkpoint D0 is looking at on the system to create the error.

Don

**UPDATE AND EDIT FROM DELL**

Please update to BIOS revision 1.1.4, which was web posted today to address this issue.