Ismail, First thing we need to do is take the expansion cards out of the server and then reseat the riser. It sounds like you have reseated already. Once the cards are out then boot and see if error cleared. If so then add expansion cards back one at a time until error returns, isolating the failing part for us. If the error persists with cards out then try swapping out the riser with a known good and see. If it is still failed then the likely choice is the motherboard is out. Let me know what you find.
Hi, Our one of  Poweredge R900  server is crashed down. I am  looking through  forums, and tried some offered  ways to resolve the problem.  But I could not  fix the problem.  Please help me. To summarise the issue: After the  crash down,   alarm monitor on front side was as: Err Code : E171F PCIE Fatal Err B22 D0 F0    E1422 CPU Machine chk I1911 1. We tried to reboot the server, but could not success.  SUSE Enterprise 9 is installed on the server. Suse tries to boot, but  freezes a few minutes later. 2.   On the server,  4 Memory riser boards,  1 io/riser board  was installed. I tried to change all these  riser boards with new ones, if it is a hw problem,   but  situation did not changed. 3. I could not  run any dianostics through utility  partition, utility partition is not available 4.  I  downloaded new versions of SUU and SMTD  utilities to  update firmwares and BIOS,  I tried to boot with SMTD. First interface opens, after I choose one of  boot options,  it fails with an error :  "NMI received for unknown reason 31 on CPU0"   or    "NMI received for unknown reason 21 on CPU0"    or freezes. 5. I succeed to  update the BIOS from 1.1.13  to  1.2.0   through  booting  DOS  from usb.   It did not effected the situation 6.Then  I am trying to  upgrade BMC  firmaware, but  could not a way.   There is no firmware option for  DOS floppy on DELLs page for BMC.   And as I can not boot  any linux kernel,  and any DELL System management utility, I can not use other ways. Do you have any offer  to fix my DELL R900 s problem Regards, Ismail                      
DELL R900 Err Code : E171F PCIE Fatal Err B22 D0 F0 E1422 CPU Machine chk I1911 