Freaky mobo/power problem

So after having to wait a month, my epox 8kha+ finally arrived yesterday. I just moved a few months ago and didn't have a computer and finally I was able to put that large pile of components together. It was also my day off - so extra bonus! I put it all together, flip the switch and - NOTHING. So I'm thinking the mobo is dead or the power supply - both of which are brand new. I take everything out of the mobo except the cpu and try again - still nothing. I must have forgotten to turn the power supply off because I took the atx power connector cord out and some LEDs on the mobo lit up. I found out that if I stick the power cord in partway it will power up parts of the computer, but if I put it in all the way it does nothing. I can get the LEDs, fans, DVD drive, and sometimes the HD to power on - usually first just the LEDS and DVD then a little more wiggle and the fans kick in - its booted twice but both times parts werent connected. Oh, when it DOES boot, then I can push the cord in all the way and it stays on, but if I turn it off and then turn it on again - back to nothing. It is very sensitive right now - I mean just slight pressure can be the difference between keeping things running and turning it all off. I've tried a different power supply but all I can get out of that one is to make the fans twitch. Any ideas? I've been computerless for TOO LONG! dah!

ryan