Fully agree. It's really hard to say anything based on this.
During a normal boot, the machine will be displaying a count down of
codes in the 7-segment display. But there, if you see a 2, it's not an
error, but that the booting is now trying to boot from code in the eeprom.
It could possibly stay there for ever.
You you run the built-in diagnostics, I don't think it can show an error
code of 2. And if it's when running some other tests, or software, it
would be really helpful to know what.
Also, a very silly thing to point out. There is a small lithium battery
on the CPU board. Have that ever been replaced? I don't think you'd get
an error if not, but just in case...
Johnny