I had this same problem the other night. I was putting a computer together for my grandparents. I fixed it in about 5 seconds. Check and see if you have your IDE cables right. The red line is for pin #1. On the board it should tell you which side is #1, and on your drives it should be facing at you when the computer is laying down. (facing the open end of case) Also, I think you would need 2 IDE cables... one for CD ROM and 1 for Hard Drives. I have tried using 1 IDE cable and this problem happened.
If you are getting no beeps, you either dont have your speaker plugged in the motherboard, or there is nothing wrong with RAM CPU or Video Card... as least I wouldnt think so.
My PC Specs
1024 MB RAM PC-3200
GeForce FX 5700 128 MB
80 Gig 7200 RPM Hard Drive
56k Modem (OH YEAH!!)
8 Channel Onboard Sound
5.1 Logitech Surround Sound
KDS Xtreme Flat Screen Monitor 17in.
Logitech Cordless Mouse
Running my long awated watercooling. Double radiator setup. 3 120mm fans right now. Finishing case.....