Hello Devhux,   Can you provide some history on this server;  Was it working and now it does not? If so what was done around the time this started?   You can find the default iDRAC password on the pullout luggage tag on front of the server.   You may be correct thinking motherboard.  Let me put these troubleshooting steps, most you have done already, to see if you completed them thoroughly and if you have just check it off and move to next one:   drain flea power (shut down, disconnect power cables and Network cables, hold in power button 20 seconds with cords removed).  After flea power drain, system has to set for 3 minutes for DRAC to reset without any power plugged in, then plug in NIC and power but wait 2 minutes before power on to give DRAC time to initialize.   Check results   Clear NVRAM - there is a map under the lid to show the jumper location. Shut down,  Set jumper to the Clear position, power on and Post up to the jumper error, shut down and return to original location.   Check results   Minimum to post testing The minimum components to allow the Dell™ PowerEdge™ T430 to complete POST are:       Remove anything not on the list: DVD, Hard drives, PERC controller, backplane, NDC, network card, any pcie cards…   While in there check for any bent pins on DIMM slots, CPU sockets, any other connectors   If it does not post then the issue is with one of those components.   If you get successful POST, put things back a little at a time until you find the faulting component.   Then update BIOS when you are able to post successfully. Dell Server BIOS PowerEdge R430/R530/T430 Version 2.13.0 [URL]  
I have a Dell PowerEdge T430 server here that won't start up. Via the console, I can see it checks memory, then stalls on "Loading BIOS Drivers." Furthermore, the default IDRAC username and password isn't working (root/calvin). I've tried an NVRAM clear, as well as the password reset jumper. Attempting to reset the IDRAC module by holding down the info button has proven unsuccessful as well. BIOS version says 2.3.4 which appears to be old but obviously if I can't boot into the BIOS, I can't update it either.  System had 1 x 16GB memory module that I've tried replacing with two other compatible RDIMMS.   At this point I'm assuming the Motherboard is to blame but figured I'd check here for any other advice. 
PowerEdge T430 halts on "Loading BIOS Drivers"