Power problem!

Ok, so im building a new HTPC, it should be a pretty sweet rig once i get it all working,.... but i cant get it to stay powered on for more than 2 minutes. So here's the hardware, Im using the XFX mATX 9300 with HDMI!, an e7400, 4gb of ddr2 800 (corsiar), a sony BRay drive, 500g HD, and a evga 260 gtx. All the parts are new, however i have somewhat narowed the problem down to the motherboard, because i have replaced the other components with known working parts. Right now im just trying to get the computer to stay powered on. I am still crashing two minutes or so in just sitting in the bios, with only the PSU, CPU, RAM installed...? my CPU temp is 22c and Sys is 24c. I have a ticket in with XFX but as i hear their customer support isnt the best i thought id see if someone here would have an idea. Thanks and ill be checking this post often so ask me any thing that might help with the diagnosis. I also think it might have something to do with voltages but IDK. Oh incase you were wondering and its all getting wrapped up in a AreoCool M40 case

update: i just removed and then re-installed the Mobo to see if there was a contact short, couldnt find anything. I have no clue what to try next other than getting a new mobo. any ideas would help.