I've got a 780i sli (not ftw) that's worked great for years. had 2 x 2GB Corsairs in slots 0 and 3. Corsair CMX2X2048-6400C4DHX 800Mhz 4-4-4-12 2.10V v1.1. I bought 2 more identical sticks and it gave error sli memory disabled and wouldn't boot stuck on post. Tried new sticks by themselves and it booted. Tried 4 again, same thing, then read I should boot off 2 and disable sli memory and manually set timings. Now it won't boot at all with even 1 stick in any slot, just detects timing and sits, can't enter BIOS. Reset CMOS no luck. Tried cheaper Patriot ram I know worked before with no luck. Had never overclocked anything, was on optimal. Is the ram bus fried? Have latest BIOS. LED stuck on 6D which mean initializing floppy which I don't have. 1 VGA card only.
Thanks

Thanks for the tip. Tried pulling battery for 30 min but same result. 1 stick in there now but it hangs. Shows Phoenix BIOS, shows memory clock 800 tcl6 trcd6 trp6 tras18 2T timing 64bit, fsb clock is 1333 and nothing below. lights on keyboard don't light up and fans aren't slowing down like they usually do after 5 seconds..hosed?
thanks again

Thanks. I have 8 sticks now, the 4 i want and 4 mid-level sticks that worked while i was waiting for the ebay ones, none work by themselves in any slot unfortunately. I see the BIOS screen but it gets stuck on the ram timing, can't get into BIOS with del. Reset jumper and took battery out a few times. Board's been awesome until now, it's a bummer it can't recover, wonder if it had been fine if i had disabled sli memory or set timings manually before inserting new same additional pair. It was on optimal.