guys i have a server that host a big website,
my problem is that the server is working 100% and the load is more than fine , but when i try to open the websites ,it doesn't open.
can you help me guys >??
Aside from all of the other great recommendations above, I'd also suggest confirming that Apache is running fine. There could be a fault vhost contained inside the httpd.conf file that is causing Apache to fail upon restart/start.
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We'd like to help, but the information you've provided is so vague as to be useless. What do you mean, "when I try to open the website it doesn't open"? That could mean any of about a hundred things!
For instance, is there an error message? Does it just sit there and timeout? What do the access_log and error_log say? Can you access other sites on the system? Can you access both older and newer sites than the problem site? What do you mean by "the load is 100% fine"? All these are required to be able to give you a meaningful answer.
There are lots of good server admin companies out there. Two that come to mind are rack911.com and configserver.com.