-- I built a new computer , the conflict is when i turn on my pc i never get to the bois for somereason nothing desplays on the screeen. When i look into the case everything is on, only thing thats doesnt seem to work is the dvd roms dont open ,,, no noise is made from the MB and the green light is on,,,,

Specs:

-- Intel Pentium 4 Extreme Edition 3.73 GHz CPU

-- BFG Tech BFGR79512GTXOCSINE Geforce 7900GTX 512MB 256-bit GDDR3 PCI Express x16 Video Card

-- ASUS P5ND2-SLI Socket T (LGA 775) NVIDIA nForce 4 SLI Intel Edition

-- Western Digital Caviar SE16 WD2500KS 250GB 7200 RPM 16MB Cache SATA 3.0Gb/s Hard Drive

-- Ultra / X2 Connect / 550-Watt / ATX / 120mm Fan / SLI Ready / SATA-Ready / 20/24-Pin / Modular Power

Bad ram or ram not fully seated can casue the no video problem. Did you double check to make sure that the power connectors are firmly seated in the optical drives?