RedHat 7.3 on Compaq proliant 1600 freezes

[Enroth Björn <Bjorn Enroth dotcom se>]

Hi all,

I've installed redhat 7.3 on a cpq proliant 1600. I have 640MB RAM and a 9GB scsi hdd. 
My problem is that the server freezes intermittent. The server answers on ping, but nothing else. The only way to get it to run again is to power off/on. The dmesg does not give any information of value either. Anyone who have a clue of what this is?

Thanks
/Bjorn