Supermicro SYS-5018D-MTRF: What could be causing the server to hang on startup??

Question

Server equipment

Good day!!
We bought a sabzhe server, percent - Intel Xeon E3-1271 v3 4-core 3.6GHz 8MB Cache, memory - originally Kingston, then replaced with Crucial 8GB DDR3 1600 ECC 1.5v CT102472BA160B.
When starting the server (often not the first time at all), the Supermicro logo and the "IPMI Initialization .." drain are visible, but sometimes the line "System Initialization ..." is visible. The server initially wound up hard on Kingston, but managed to install the OS, and then it was planned to do everything remotely. In this mode, the server worked for about a day, after which it turned on all the ventilation and hung up again.
There were thoughts about broken memory, because when loading (and replacing about two 8GB Kingston sticks), each time the server either didn’t start at all the first time (black screen, then turning on the ventilation and that’s it, there were no squeaks), or if it started, then everything is the same, but after IPMI, sometimes with vertical stripes of different sizes in pink, blue or pink with running white.
They replaced the memory with a new one - there was also Kingston. On loading, everything is the same, but it began to squeak. If I counted correctly, then 6 (?) Long and 3 short.
Sometimes it happens that it starts normally, but at the stage of connecting the RAID controller it shows the cursor on a black screen, it stays for about a minute, and then reboot and start all over again.
Yes, I swapped power supplies and started from one unit in turn.
Starting without RAM at all led to an IPMI test and a squeak at number 15 - no memory.
I checked the legs of the connector - there are no bent ones. Percent fresh.
Sometimes it happens that during IPMI the green diode on the mother near the LAN flashes.
I sin on memory, because I need, as it were, a UDIMM, but the Crucial indicated above is in the list of compatible ones and there were all hopes for it. The second pair of Kingstons were RDIMMs exactly when the beep was.

Answer 1

Take the supermicro brains off the sheet and test them with everything else turned off, the supermicro has built-in tests.