Esxi 4.0 keep rebooting after few days

Our Esxi 4.0 server keep rebooting in every few days. I want to check the Logs but not sure how and what to check in the Logs. Need help in accessing and interpreting logs files on esxi 4.0  server.
Rajesh KumarAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Have toy checked the hardware, e.g. CPU, Fans, Memory ?

Is the Server on the HCL for ESXi 4.0 ?

When a ESXi 4.0 server reboots, often the logs are erased, they are not persistant.

the logs are in /var/logs/

vmkernel.log is the log you'll want to check

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Rajesh KumarAuthor Commented:
ESXi 4.0 is installed on Dell Power Edge 2950. When you say Check CPU, Memory? How do you check that? by opening the server??

Also when i logged in Server it gave me 4 options under View System Logs
3)Management Agent
4)VirtualCenter Agent

I went into all of those and it is zebrish to me.
Not sure how to check the logs you told me.
Is there any way i can copy the log files from server and attach it over here. Please tell me in details as i am no vise in this.
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Yes, opening the server is a good idea.

Also check and run diagnostics.

Reboots are often called by hardware failure.

Has this just started to happen, or is this a new install.
Rajesh KumarAuthor Commented:
Ok, I will run the Diagnostic test and see if it point out to something. It just start doing in now. No It was not updated recently.
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