First build- not booting

Hi Everyone.

I recently bought some parts to start my first build, however after assembling everything, the computer refuses to boot. here are the parts.

Xion Solaris Black/Green ATX Mid-Tower Case with 450 watt power supply
AMD Athlon 64 X2 4600+
Seagate Barracuda 7200.10 250GB Hard Drive
Patriot 2048MB PC5400 DDR2 667MHz Memory
ECS A780GM-A Motherboard
Dvd drive

When everything is connected it, with a monitor and keyboard,mouse it does not boot. The fans connected directly to the board work. I tried changing the slot the ram was connected to but that doesn't work, i also cleared the CMOS, but nothing happened. I also tried a 512 mb 533 mhz ram chip but still no booting.I even rechecked all the connections,jumpers and the CPU but nothing happened. I attached the wires for the case i saw in a picture from a post here on Afterdawn, here's the link.
http://forums.afterdawn.com/thread_view.cfm/677298

I would really appreciate any help. Its been 3 weeks and i don't know what to do.
Thanks for your help everyone.

 

Probably a dud motherboard. ECS aren't known for their quality. I'd replace the PSU sooner rather than later too, cheapies like that are positively dangerous. Go with a 380W Antec EarthWatts, they're good units.