Greetings,
I recently encountered a similar issue on the x79 platform with Core i7 3820. And I could use some help.
All parts brand new out of the box.
No POST, No Beep Codes, Red CPU Light.
Mainboard: Asus Sabertooth x79
CPU: Intel Core i7 3820
RAM: 2Gb OCZ Gold DDR3 x 6 modules
PSU: OCZ Gamestream 850W
GPU: 2 x evga GTX 260
I assembled the aforementioned parts all brand new. At first I went with a simple configuration just to get to post and see it detect disc drives, and start tinkering with the BIOS.
So I went with one disc drive, 2 modules of memory, and PSU, CPU, and one Video card for now. Flip the switch on the PSU and the green light is on the mainboard. I hit the case's power button and I get a red CPU light on the motherboard. No Beep, no Post. Power supply resets automatically after about 5 seconds, and tries again. Same thing, this just repeats.
When I powered it on, all the fans are turning all the case and 120mm fan lights are on. GPU fan is moving and the DRAM light on the mainboard is indeed off, as it should be.
But the CPU light is red, no POST, no beep.
So I do some research. The few problems people have had around the X79 seem to mainly be the DRAM light and memory incompatability. Much of these resolved by flashing the BIOS to the latest version.
Also it was mentioned a few times that the CPU was released after the mainboard, therefore some incompatiblities with the 3820 might be the problem.
So I downloaded the latest version of the BIOS straight from ASUS website, and renamed the .rom file and proceed to EZ flash it with USB. The blue indicator light blinks for about a minute while its updating and stops when its done. Mission accomlished. I reseated the CPU, and changed RAM modules. Just to be safe, i switched Video cards as well,and used the other PCI-E x16 slot. This time I was sure I had it. I hit the power button on the case and....you guessed it
CPU light is red, no POST, no beep.
I remove the PSU and swtich it out with another one from my other desktop that I can be certain works. Its an older antec 650W but it is still sufficient to meet the needs of one GPU CPU and 2 Memory Modules. I remove the whole works from the case to make sure its not getting shorted somewhere. No dust or contamination, the workspace is immaculate. Power it up...
CPU light is red, no POST, no beep.
I do not have another LGA2011 compatibile CPU to test out, and no other mainboard that uses an LGA2011 socket (its been a few since i've built a new machine), So I have no option to switch out a CPU or mainboard.
But I've replaced PSU, GPU, RAM, tried all configurations in all slots. Succesfully updated BIOS...just no luck.
Long story short, I called ASUS they agreed to RMA the mainboard after I went over what I had done to troublehsoot it. I sent it back to the shop. They tested the mainboard and to my surprise said it worked. So the RMA department where I purchased all the components asked me to send back the RAM and CPU as well and they will test the whole works.
I did that, they called me a few days later and confirmed my CPU was dud. Brand new out of the box and it didnt work. So they replaced it with a new Corei7 3820, tested it all out and called me back again two days later and confirmed it all worked. They shipped it back to me with RAM and CPU already pre-installed..finally I think I can finally get this build going.
I get it all back, reassemble it into the ATX Case, re-connect PSU and one GPU. Plug in one HD and one optical drive and guess what...
No POST, No Beep Codes, Red CPU Light.
This is about where I am now. I repeated the whole troublehsooting from before sending it off for diagnostics and still the same problem.
I am at my wits end. Any input would be appreciated.
Thanks