boot problem sun V890

hello
i have a sun server V890 and it stops booting after adding 2 CPUs modules and gives me the following error message:
Enabling system bus....... Done
Initializing CPUs......... Done
Initializing boot memory..
RAM-Copy CRC failure!Can't start: No image found
FATAL: Can't find/decompress Forth/OpenBoot dropin module
OpenBoot Re-Configuration Reset Executing POST w/%o0 = 0000.0800.0201.2041
FATAL: POST not found or image corrupted in this PROM

the problem countinued to appear also after removing the new modules

please could you help me find and solve the problem ...... thanx