I have built a new system specs below it has powered on once the shutdown after about 5seconds. It does not turn on at all no LEDs, and the fans don't start to spin. I have a few questions...
-first what is required to be plugged in for a mobo to boot?
-I have a power supply with a 24pin connector and 8pin connector do i plug both in ?
-Do i need to have the case inputs Powere Switch, Message/Power/LED, and Reset HD LED plugged in to boot?
1) the switch
2) yes you do
3) all you need is the power swtich - thats needed to power ur board. The led (power led) does help to see whats up with it
what psu are u using? whats the wattage? Pls dont tell me its the one that came with the case.. as those are cheap psu and wont be able to power your vga card. also check if you've plugged in the vga power connector.
Shutting down after 5 seconds could be an overheating problem. You could check your cpu fan. Where u cant boot at all again could be due to some mistakes in your build, like missing out some psu connectors somewhere. Hopefully you didn't damage anything on the first boot.
If it turned on once, even for 5 seconds, and now won't turn on at all, that's not a good sign. Perhaps something shorted on the mobo, and it is now dead. It could also be that the PSU cut off and needs to be reset. Unplug the PSU for a minute or so and see if that makes a difference. While you're waiting, recheck your connections, and make sure there are no loose screws, bits of wire, or other FOD loose in your system.
What about your old system? Can you test any components in that. The power supply maybe? Or perhaps you could pull the powersupply out of your old computer and try it in your new computer. Like jsc said, you only need the cpu with fan, 24 pin connector, 4/8 pin cpu connector and the power switch connector from your case to get the motherboard to post. I would rule out the psu before I RMA the motherboard.
If you don't have other components available to you, disconnect all drives (both from the mobo and the psu), take out all memory, and take out the video card and try again. Just to be sure.
If you're really feeling ambitious, search the net for instructions on which two pins to short to turn on the psu manually. Ofcourse you would do this with the psu outside the case and not connected to anything.