Hardware Issues

I bilieve a piece of hardware is failing in one of my servers (drawing my conclusions on the network card), though I wanted to know what commands can I run to test ram, cpu, etc?

Also what logs should I be looking at for errors, and if there is anything else I can do?

Also how do I find out what hardware I have installed, I'm running a fedora 2 machine with cPanel (would prefer all the command be in shell form). Hardware Issues

 

 

 

 

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