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well, one thing you didn't mention was beebing comming from the machine. this means either that there is no PC speaker attached to the motherboard headder for the speaker, or else the board isn't even getting far enough to try and POST (generally half a second isn't long enough for the board to POST, so this would make sense). on that note, there is still the possibility that the board is detecting a problem immediately that is causing a beep code error then shutting down.
before we get going down the troubleshooting steps, look in the motherboard manual and find the CMOS reset jumper, and go ahead and see if resetting the CMOS settings helps the situation any.
ok, assuming that you have checked and double checked that a PC speaker connection to the speaker in the case is plugged in correctly, or that the motherboard provides its own little speaker, and there is no beep code, i'm gonna have to go with a potential power problem here as the first assumption.
try pulling the memory and video card out, as well as any drives or anything else attached to the motherbord (disconnecting them from the motherboard is fine, you don't have to remove the drives physically from the case) and try powering on the system with only the CPU attached. see if you get any beeps then (which you should having no video or memory). also, unplug all the case fans as well, leaving justt he cpu fan. if you still get nothing, you might try and remove the CPU.
the only real way to see if the motherboard is responding to power at this point would be any LED's on the board itself, or the front case power LED if it is still attached to the headder on the motherboard, and the beep codes from the PC speaker. if it still gives no indication that it wants to beep or stay powered on for more than a split second, you have narrowed it down to either the power supply or the motherboard. at this point you might want to physically remove the motherboard from the case and check to see if there is anything underneath it (like a stray screw) that could be causing a minor short or ground to the case and preventing it from booting. if everything is clean and you have all your stand-offs in place giving good clearence between the motherboard and case, then you might want to dig up an old power supply and just see if it can bring the board to give any beep codes. any power supply will do in this case because you won't be pulling much power with the board by itself. at this point you should be able to determine if the motherboard is bad (if chenging the power supply brings the same results) or if the power supply is bad (if swapping the power supply produces the beep errors).
good luck!
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