Server keeps crashing, what should I do?

I just sent a new server to a datacenter and it keeps crashing. It's a AMD 1600 Athalon with 1 gig of ram, 40 gig HD, Red Hat 7.2 with a new 2.4.19 kernel. I got the server from the vendor, installed 2 512 mb ram modules, installed a cdrom and then installed Red hat. I then packed it up and sent it to the datacenter where it booted cleanly and was online. Ever since then it just freezes and has to be manually rebooted. I tried the new kernel thinking that would help, but no luck. I then thought that it may be Webmin or Apache, cuz that's what I was working on. So I uninstalled the RPMs and reinstalled from source, but it froze after I installed webmin and was configuring apache. Is there a way to check the RAM and the hard drive?

 

 

 

 

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