Ok, it does boot up, but it takes about 10 minutes.
I updated the bios. Did not help.
OK. I guess you have 3 x 4 GB RAM RIGHT?
Go to bios ans put Ram multiplier in 6 and try againt.
and tell me what cpu speed the bios say.
this computer has 24 gig of ram
6 x 4gig sticks
OK DID YOU PUT THE RAM MULTIPLIER EN 6???
I GUESS YOU DID =)