Originally posted by: rise4310
i know you said you pulled everything but you tried reseating the cpu? the 4 leds indicate your ready to boot but it can't find the cpu. is that a venice core?
and yes make sure you have all 4 connectors in and the ram in either slot 2, orange closest to the edge of the board, or slot 2 and 4.
just for future reference as the dfi manula blows.
4 red lights = system start-up
3 red lights = CPU detected
2 red lights = DRAM detected
1 red light = VGA detected
0 red lights = system boot-up
Yeah, what he said....
rise4310 has definitely got the right idea.... Check your CPU first (if possible, try it in another board). If you DO have a Venice, you will likely need a BIOS update before the board can use it. If you do NOT have a Venice, and your CPU checks out OK on a different system, then cut back to only a SINGLE stick of RAM in slot 2 (The orange slot that is closest to the edge of the board). This board is quite picky about RAM configuration.
Additionally, make sure that BOTH of the extra power connections on the board (1 molex, 1 floppy) have power leads connected to them.
If all of the above check out OK, then disconnect EVERYTHING peripheral (all Hard drives, floppy drives. CD driver, all add-in cards (except the video card), and anything else not ABSOLUTELY necessary to get at least the initial POST screen), and then try to boot again. NOTE: If you ARE using 2 cards for SLI, take 1 out, and make sure the board is set to non-SLI mode, just to eliminate the possibility of it being the 2 cards that the board is having issues with.
If you still fail to boot, pull the motherboard, and check that you have no extra spacers (the little brass mount screws) behind the board which may be shorting it to the case, and carefully re-connect only the essential power wires/components.
If it is still not working, try a different PSU (even an older small one should still have enough juice to fire up your bare essentials, and will tell you if the problem is a fauly PSU).
If all of the above does not resolve the issue, then you have to consider... If your CPU works in another system, and it is not a peripheral issue, and the PSU works in another system, but a different PSU does NOT work on this board, and you are not having the Venice core issue, then you likely have a dead board. When I bought my DFI Nf4 SLI board, I got 2 dead ones in a row (and from a usually VERY reliable retailer -- my local PCClub store)! It was seriously driving me nutz, because I did not have a second rig to test my CPU and PCI-E card in (all of my other rigs are 754 A64 ones, with AGP graphics). I finally took my CPU and videocard in to the store, and had them try it in a new (3rd) board, which did work. They were at a loss to explain the 2 dead boards, but were very willing to help troubleshoot/test even my own components, which is nice of them). The troubling thing is, that with my board, I got the same result -- all 4 leds went to ready, but no video, and no boot. It made me think my video card or CPU was toast.
Good luck, and let us know what you find.
I have rebuilt my PC with the above board and and a 3000+ (waiting for FX57) 1GB of OCZ VX PC4000, 2 raptors in MIRROR on the Nforce controller and 4 Maxtor Maxline III 300GB on the Silicon controller in raid 5, DVD and CD rewriters on IDE plus some other odds and sods. Power is Enermax noise taker 600. Troulbe is I cannot get it to boot past the 4 diagnosic leds on the motherboard it just sits there. If I power up from the front switch it powers down again after about 4 seconds. If I boot from the motherboard power switch it stays on with the 4 leds lit. I have pulled everything back off the board again and tried some Crucial value ram in slot 1, the OCZ is in 2 and 4 but it is still the same even then. 
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