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Since you have replaced the motherboard 3 times, it seems to be the processor the defective component.
I would suggest contacting our warranty support center at your closest location:
So they can assist you, when you call them please have the 3 motherboard model numbers handy as well as the processor on your hands, since they will ask you for some information on top of the processor, just as showing here:
Thank you for the feedback. I've since gotten an RMA/Order# and have shipped the defective CPU off to the required destination.
I have the exact same issue. PC died, RMA mother board and CPU led on new board. Called Intel support and support try to blame it on the memory. I have CORSAIR Vengeance 1600/1.5v (CMZ4GX3M1A1600C9). Something is up with this CPU
Well it definitely was the CPU. Got the one they sent via Warranty switch and lo-behold the motherboard booted right up without a hitch. Finally! That was a long 2 months. getting this fixed.
I have the exact same problem but with the gigabyte h67ma-ud2h-b3 motherboard. The fresh build worked great and allowed me to install Windows 2008 R2. After that I went into BIOS to tweak some settings and out of nowhere my screen started artifacting (was using the on die video). Within a couple of seconds the system rebooted with all of the symptoms described by the OP. <1 second power-on before rebooting with no beeps, just 1 green LED from the phase lighting. Tried 3 different brands of RAM, PSU, etc. Getting new motherboard tomorrow to test. I don't understand how it could work so well and then suddenly stop working. The stock heatsink was secure and did not see temps above 45C while I was working on it.
Did this start happeneing after you started/updating drivers?
I thought I had a ram/mobo/cpu issue with mine with random shutoffs.
The issue turned out to be the most recent version of a Nvidia driver.
I removed the driver comletely and installed a version from a few months ago (after I swapped a ton on components and got nowhere)
Try newer or older drivers. Just because you have the newest driver doesn't mean that driver is any good.
Update to my last reply:
Got motherboard replaced and have the system running perfectly.