Re: when I boot I get the messages USB1, 2, and front I/O cables not connected. 630i has a daughter board aka master IO board Dell CY620 that feeds front panel cables to the motherboard.  If you did not transplant this small board and associated front panel USB ports into new case you would run into startup error. [IMAGE] [IMAGE]#5 internal USB connector (USB_MB) #10 front I/O panel USB, audio, and lights connector(FRONT_AUDIO_USB_LED)ref service manual p.101/120
I just finished building a semi custom XPS 630i because it was something to do with spare parts I had, and stuff I got off Ebay. I did this in an effort to start doing some overclocking. It is put together in a Rosewill case runs a QX9650, Cooler Master Core Extreme heatsink/fan, 8GB Kingston HyperX 1066 RAM, ASUS GTX770, 500GB Crucial MX SSD, and is powered by 650W full modular PSU.  After some teething issues installing Windows 10, it is running, and stable. My question is (keeping in mind it is not stock) when I boot I get the messages USB1, 2, and front I/O cables not connected. Is there a way to eliminate these messages? It has no effect on performance or booting other than I have to hit F1 to continue to boot sequence.  No 1394 cable message because I had an old rear card style cable, so I plugged it in (Not that it'll ever get used) and both MOBO USB connectors are plugged in. What am I missing, and how is it detected? Thanks for any help, Stephen.  
XPS 630i, custom build, boot question, BIOS 1.0.13