I have 3 identical blades SBI-7142G-T4 that are not posting video display. I try from KVM dongle and same issue.
Each blade has:
4x Opteron 6272
16x Hynix 16GB PC3-8500
The current BIOS version on your blade may not support AMD 6200 series processor. Use AMD 6100 processor to see it can post first. If yes then contact our Super Micro technical support team to obtain the latest update BIOS version and update before using 6200 series.