Supermicro SYS-5018D-FN4T keeps resetting after POST

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I have an olish SM SYS-5018D-FN4T (X10SDV-8C-TLN4F) which recently suddenly crashed, and since then only went through the POST process. then resetting. It is impossible to even get into the setup using DEL after POST. Following some googling I changed the CMOS battery to a new one and wiped the CMOS and also upgraded the BIOS (via IPMI) to 02.14 but it still does not want to come back up. The Event log shows nothing. and the ipmi post snoop shows b2 before it resets again. IN the IPMI Server health. all sensors are shown as ‘not present’. 🙁 Anyone have an idea how to debug this further?
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