Serious help needed

Ok all, I need help with my new build as it fails to post. When I powered it up it just sat there. The specs. are: X2 4400+ w/stock heatsink, ASUS A8N32-SLi Deluxe MB, 2GB Corsair XMS memory PC 3200, Antec Truepower II 550Watt PS, WD250GB 2500KS HDD, Lite On DVD ROM and DVD burner (dual layer) and Sapphire X1800XT 256 MB. I'm sure I may be missing something really easy but I need fresh eyes to tackle this so I'll try again tomorrow. A little more info., the dvd burner light stays on constantly but the ROM drive light does not come on at all. I suspect its the cable. I tried to do the initial test with the ribbon cables since I didn't have any others handy. I'll pull the rounded cables from this comp. to test it tomorrow. Also, the case is an Thermaltake Armour and the blue leds light up but the fans don't turn. I think its the mb issue because I also have them hooked up to headers on the mb. I'll try tomorrow with just power from the ps. Any one else have ideas they want to share? Thanks for looking!!!