Have you made sure internet sharing is turned on on the laptop?
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This thread has alot of helpful tips
this part inparticular should help you as you said you have a brain lol
1. Make sure your laptop can connect to the internet using WLAN (Wi-Fi) and LAN (Ethernet) without switching between them. Some laptops have a switch option which only allows you to use one at a time. There should be a feature in the BIOS (setup when you first turn laptop on) to turn it off. Make sure both can be used at the same time.
2. I did a quick test. I plugged my laptop with Ethernet to my router and had my wireless on. Using the classic start menu (can be changed by right clicking on taskbar and go to properties and under start menu tab), go to Start->Settings->Network connections. You should see network connections such as Local Area Connection (LAN) and Wireless Network Connection. When my laptop was plugged in, I had both, LAN and wireless connections active (without an X on them). Test your internet via browser. Should work. That should fix a lot of the problems. You can also put the mouse cursor on the network icon on the bottom right corner with the blue globe. Two networks should be visible, LAN and wireless. If you gotten this far, the rest is quite easy.
Step 2(Medium part)
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1. Take your laptop to the PS3 and connect the Ethernet cable between laptop and PS3. Go back to where all the networks are displayed which I explained earlier from Start->Settings->Network connections (using classic start menu). You should see LAN with a red X on it and the wireless network connection. Make sure you can still access the internet.
2. Right click on the Local Area Connection and go to properties and then the Sharing Tab. The first check box should be unchecked where it says 'Allow other networks...to connect through this'. Under home network connection, I have it set to 'Select a private network connection'. The other checkbox is checked but cannot be accessed, where it says, ''Allow other networks users to control or disable.... Press okay and you should be back to the network window.
3. This time Right click on the Wireless Network Connection and go to properties. Make sure you still have a globe on the bottom right corner (Still have access to internet). Go to the sharing tab. This window should be similar to the LAN one. Have both checkboxes checked. Under Home Network Connection, choose Local Area Connection. Press okay. You should be back to the network window. On the Wireless Network Connection, you should see the SSID name, green bars and the word shared after the SSID network you're connected to. The LAN icon should say network cable unplugged with a red X on it.
Step 3(Easy part)
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1. On your Playstation go to settings->Network Settings. Go to Internet Connection Test. The PS3 will start connecting to the laptop and the Ethernet jack on the PS3 should start flashing green. It should find the IP address and connect. On the network window on your laptop, the LAN icon should say Enabled and then Unidentified network. You shouldn't be seeing the red X mark on it. 2. Your PS3 should be connected now. Test it out. You can also still access the internet using your laptop simultaneously with the PS3 using the internet. Remember, there should still be a green globe on the network on the bottom right corner. 3. That's it. Hope this lengthy explanation helped. Worked for me so should work for you. Peace out!
It sounds like to me though like a lan/internet sharing issue make sure you have shared internet as well as a lan connection turned on and of course that it is the proper lan connection turned on.