Page can not be display

I had a wired problem with my website that used apache v2.047.
The problems like the followuing

Client#1 type in my website URL and got home page displayed on browser
fine.

Client#2 type in the same URL as client#1, Browser just in waiting
mode and no page was rendered. After a while "Page can not be display"
come up.
I had checked Apache access.log
**********
Client#2 Ipaddress - - [16/Oct/2003:17:09:25 -0700] "GET / HTTP/1.1"
200 4096
*********
which indicates that the request had came to apache and apache pushed
out the home page. For some reason it did not arrive to client site.

However I had done the following testing with client#2
A. Ping my website, works fine.
B. I can Yahoo message to communicate with client#2
But not able to send file through IM.

Any help will be greatly appreciated.