X299 Three long beeps and no output to console error

[applegrcoug]

I have an MSI X299 SLI Plus that I've been using with a 1080ti to do my media server. I swapped monitors today and then all hell broke loose. Now, I can't get the thing to boot properly. I get three long beeps and the led code D6, which is a no output to console error...GPU type thing.

So I try resetting the bios. Nothing. Try swapping the GPU. Nope. Try swapping slots. Nope.

Any ideas as to what is going on??

 

[Mega6]

Well the obvious step 1 - identify the beep code.

If 3 long beeps are heard, remove all
memory modules and try to install only
one memory module in the DIMMC1 slot
first and then restart the computer.

 

[applegrcoug]

Yeah, that was the first thing I tried before even identifying the codes....no dice.

 

[Mega6]

Test the RAM on another board, use different RAM in same board or start the RMA process on the RAM. Really nothing else to go on here.