I've been reading all the threads about successfully upgrading the 700 or 710 mobo but I'm having a problem that I cannot find an answer.  I have the XPS 710H2C system w/4 GB memory and the dual NVIDIA 8800GTX video cards.  Okay, I was able to remove the old mobo and replace it with the new one.  I moved the DuoCore X6800 processor over to the new board too according to instructions.  I put the system back together, checked all the electrical connections once more, and the system will not boot. All electrical slots on the mobo have a connector except for the FlexBay connector (INT_USB) (position 8 on the mobo) that I could find no connector to plug into it.  I only installed one video card in the primary card slot and attached a keyboard and mouse.  I also removed 2 gigs of memory and removed and reinstalled the memory once again.  The power button is a steady amber color which means a device is malfunctioning or not installed correctly.  There is also no beeps and the diagnostic lights do not light up when I turn the system on.  I'm thinking it could be one of the SATA drives not properly installed but I made sure the top harddrive was connected to the SATA0 connection and the lower harddrive was connected to the SATA 1 connection.  Then I plugged in the two DVD drives into the SATA4 and SATA5 connections.  I unfortunately did not make a note of my SATA drive connections before removing them from the old mobo but I believe I should be able to get into the bios with just one harddrive plugged in.  Therefore, I think it's something else amiss.  Anyone have any suggestions or solutions before I call tech?  Thanks in advance for any assistance.