I would guess since it booted up before and now it is continually looping that the BIOS needs re-setting.

I think it just shuts down since it isn't seeing a USB keyboard. I'm having a Logitech PS/2 keyboard delivered Thursday from Amazon though, so I'll find out more then. 

Hmm, that's an odd problem. I know mine didn't care if anything was plugged in so something else might be wrong.
 
 

hallowen
Sorry to hear that, But hopefully you'll have No Problem replacing the NB Chip. 

Yeah, I have a bunch of dead gpu's to practice on so I'll likely have no problem with it. Got the chip ordered up (AC82X58 SLGMX) and I should get it in a couple of weeks.
 
I need to do this for my GTX 580 Lightning Xtreme as well because the core is toast, I have to torch it every single time I want to bench it. 

tucker147
Hmm, that's an odd problem. I know mine didn't care if anything was plugged in so something else might be wrong.
 
 

hallowen
Sorry to hear that, But hopefully you'll have No Problem replacing the NB Chip. 

Yeah, I have a bunch of dead gpu's to practice on so I'll likely have no problem with it. Got the chip ordered up (AC82X58 SLGMX) and I should get it in a couple of weeks.
 
I need to do this for my GTX 580 Lightning Xtreme as well because the core is toast, I have to torch it every single time I want to bench it. 

I really hope not. It POSTs successfully, sits at splash screen for a minute as though waiting for input (from non detected keyboard), then reboots.

Halo_003
 
I really hope not. It POSTs successfully, sits at splash screen for a minute as though waiting for input (from non detected keyboard), then reboots.

Are you using the orange ram slots? Try each stick of ram by itself as well. And give the secondary bios a try if you haven't already.

tucker147

Halo_003
 
I really hope not. It POSTs successfully, sits at splash screen for a minute as though waiting for input (from non detected keyboard), then reboots.

Are you using the orange ram slots? Try each stick of ram by itself as well. And give the secondary bios a try if you haven't already.

 
Yep orange slots, 3 DIMMs. I tried running each stick in each orange slot individually, tried swapping PSUs. (previous one was an old old one and only had 8p + 4p CPU instead of 8+8). I also tried switching from X5670 to my old i7 960, still not able to get keyboard working.
 
So far, no luck, tried both BIOS as well. I think it boot loops because there's no SSD connected, thus no OS to load. It's possible it's just my keyboard, I'm really hoping the Logitech one coming works, that would make my life so much less stressful.
 
If I can get it up and running fully my X79 stuff is gonna go bye bye. 

Well I got a 980Ti Hybrid today along with my PS/2 keyboard, so far no luck. It gets to the splash screen where it shows POST code 3E, then turns back off. Ideas welcome. 

You said previously that you switched PSU's, But it made No difference. Can you check the operation of those PSU's by installing them a known working System?

hallowen
You said previously that you switched PSU's, But it made No difference. Can you check the operation of those PSU's by installing them a known working System?

Yessir I did that today, so far I have tried:
 
ABS Tagan BZ1100 (old)
CM Silent Pro Hybrid 1300W (in main system, tried today)
CM V1200 Platinum (just unboxed)
 
I initially tried with the ABS one, figured maybe it was old enough that the 5V rail had degraded. But it doesn't seem to be the problem.
 
I also tried with a GTX 285 Classified, 9800GTX+, GTX 570, and a Radeon 9250 (PCI), all of which had no effect. I'm confused because with a PS/2 keyboard I at least have power to it the whole time, but it stays stuck at the splashscreen and then shuts down. 

I thought that 3E code would refer to a problem with the RAM or the CPU, But you tested/replaced those also. Maybe try to reflow the solder on the NB again?