[CentOS] [CentOS 5.5] Program/method to test integrity of the system/packages

Hi,

we have a cluster. The master has CentOS 5.5 on it. At the moment it
crashes randomly...perhaps a hardware problem...no idea. But to
eliminate a software problem I would like to test the integrity of the
system or of the installed package. Is it a way to check if the binary
installed by binary.rpm is the good one ? with md5sum or something else ?

Thx a lot,
Guillaume