If you have just installed WAMP server and you get a blank page at http://localhost/ it could be because of one of these problems…
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Port 80 used by another service
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localhost not defined
This is the most common cause for this problem. Click WAMP icon in the taskbar –>Select Apache –> Service –> Test Port 80. This will check the availability of the port 80 on your system. If the port is occupied by some other service you will have to close that service or move it to another port and select “Restart all services” from WAMP menu. In my case it was occupied by Skype.
If the port is free and you still see a blank page, try http://127.0.0.1/ instead of http://localhost/