So by what I can read : 4 : bios checksum invalid 3.4 : ram configuration in progress 2 : pci configuration in progress 1.2.3 : Indicates routine system activity subsequent to video initialization Have you ever changed the cmos battery ? if not, try to change it and lets see if it solves it
Having some problems with an older T3610 workstation (2013).  Today it just stopped working...   When I boot it - I do not hear any post beeps - the machine lights up '4' and then '3', '4' - then the amber '2' is lit.  Then the hard drive icon blinks for a minute - then '1', '2', '3' amber lights come on in the front panel - and the machine just sits there...   Any thoughts as to what is going on?  I checked the manual and it says that 1, 2, 3 is reserved...  Which does not tell me a lot...   The machine has a Xeon processor, mirrored 3TB opsys drive and 32 GB of memory.     Bradley MacDonald brad_AT_timeacct_DOT_com    
Precision 3600 - Just stopped - now has 1 2 3 on front panel ??