A recent photo of your hardware setup would be helpfull.
1) Try to take everything out of the motherboard.
With the main AC cord out, put only the PSU connectors (both of them) to the mobo.
2) Now put the ram and check double to put it in the correct slot!
3) Give power to system with NO GPU connected.
Listen how many beeps you here.
Be advised from your user manual to check if only GPU is missing.
4) If it's ok, then switch off the psu and put only one GPU and put the psu connectors too.
5) Try to connect the monitor and cross your fingers!
6) If it's open and produce the bios image, ok
7) After that try to put the next GPU and do the same with the connections
Finish with all of them and keep you eye on temperature and fan's.
Hope that helps a little