SYSTEM ALERT when rx2620 system boots

[ub2000]

We have an old spare rx2620 Itanium server that is defective: 

it boots to a point (finds the OS and loads kernel etc.) but the system then always resets with:

************* SYSTEM ALERT **************
SYSTEM NAME: hpux-rx2620-00

14 Feb 2016 04:41:49
Alert Level 7: Fatal
Keyword: Type-02 137001 1273857
Machine Check initiated
Logged by: SFW-redundant; Sensor: Critical Interrupt
Data2: OEM Code2: 0x00
0xC156C0058D020E60 003FA17000130300

A: ack read of this entry - X: Disable all future alert messages
Anything else skip redisplay the log entry

then it reboots. This happens always, no matter wether you boot from disk or from installation DVD.

Is there any way to find out what it means and to fix the issue?

Thanks,

UB2000