Computer won't connect to internet?

I have a Gateway LT Series Netbook. I've had for about 1 year now, and ever since December 2011, it hasn't been connecting with the internet. Today, I got the courage to try to resolve my issues, though I'm not an expert at these things. So far I've changed my TCP/IP Propeties to 'Use the following IP address' and 'Use the following DNS server addresses' options. I manually inserted my IP address and subnet mask. I have no default gateway and use the DNS Servers 24.25.227.55 &
24.25.227.53
My actions have caused me to gain a well internet connection but, the only problem is I can't get to the internet itself using google chrome. It has the 'DNS server lookup failed' error. I've tried other DNS Servers such as the google: 8.8.8.8. I still don't know why my computer says my connection isn't active. My iphone is currently using the Wi-Fi i'm trying to connect too, and I've tried restarting the router but still nothing. Any ideas why?

An IP conflict is basically two or more devices on your network using the same IP address. Most of us at home use a DHCP type of configuration or what is called a dynamic IP, meaning the IP address on your computer is automatically assigned by the router on your home network when your computer is turned on. There are cases where a home user might prefer to use a static IP rather than a dynamic one, for example: having devices on the network that require port forwarding, like a game console. When using DHCP it is impossible for an IP conflict to occur, since IPs are assigned by the router. In contrast, a static IP is assigned by a person, and when humans are included into the equation, mistakes start to occur.So, if you are using static IPs on your network, make sure they are all different.

If you have dynamic IPs as described on the previous section, you can skip this. However, if you have static IPs in your network make sure you are using the correct IP for the Gateway. The Gateway is basically the last device on your network before going out to the web; this is usually the router. Make sure your gateway matches the IP of the router. Same goes for the IP address. The IP address must match the type used in your network. If your routers internal IP (gateway) it 192.168.1.1 your computer can't have a 192.50.1.1, it won't connect to the internet because it is on a different subnet.

for more information you can see http://www.techyv.com/questions/how-troubleshoot-wifi-internet-connection

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