Go to Control Panel/Network and Internet/Internet Options and click on the Connections tab and go down to LAN Settings, make sure that "Automatically Detect Settings" is checked.
You will want to fix this before trying to connect with your portable WiFi. If the laptop will not connect to an ethernet connection, the modem card and/or driver may be the issue.
One of the easiest ways to determine if you have a serious laptop hardware issues is to connect your laptop to an ethernet connection.
Once you have the latest driver, use the “ Browse my computer for driver software ” option to manually install the driver software.
In case you can’t connect, you will have to manually download the latest driver from the manufacturer’s website on another internet-connected device and move it to your PC.
Checking in BIOS for sleep mode options (there aren't any) Restoring the computer to the earliest possible time. Updating all relevant drivers/firmware/BIOS. Use Network Diagnostics If you have access to another computer or mobile device Running the ipconfig release/renew commands. The service will tell you whether computers elsewhere on the Internet can successfully connect to the site. If the internet is functioning with an Ethernet cord, the next step is checking the wireless router. Before working on the computer, make sure the internet is functioning properly.
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How to Fix a Computer That Won't Connect to the Internet Test the Network.