I ran into issues upgrading my R420 with a 2nd CPU and more memory.
I installed E5-2420 (2 of these) Part # 726882887 and 128GB of RAM Part #A6996789. I also installed 02827M iDRAC Enterprise card from my interpretation of the manual.
I believe I already had 7KMJ1 in Riser 1, with the new iDRAC enterprise card installed. Riser 2 has a similar card with a 4 port NIC installed.
After installing the equipment, the front panel shows "The system board Riser cable or interconnect is not connected, or is improperly connected.". Under Storage, I receive "RAC0501: There are no physical disks to be displayed"
Console does not display any output. USB ports also do not power on keyboards either. I have iDRAC Express.
There is only one power supply installed, which is 550W. I reverted all the physical changes and it still does not seem to POST. I've tried all the tricks mentioned elsewhere to drain power or reset iDRAC but that did not work.
Any ideas? Also - I cannot SSH into iDRAC even though it's enabled.