all of a sudden the other day, my computer shut down. i tried booting it up, and it did, however i had no peripherals. no monitor, no usb ports, no keyboard....etc. i got a new motherboard (oem dell replacement www(dot)ascendtech(dot)us/Itemdesc.asp?ic=MB4DELDIM4700&eq=&Tp= ). i just finished installing it and its the same as before....it boots up but still no input devices or monitor. all connections seem to be correct and everything was replaced properly. any ideas? its a Pentium 4, 3.0Ghz, 2.5GB RAM un modified BIOS.