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If you want to replace the internal wriless card its should be accessable undeer the laptop its slides out of its socket. or you can buy a usb wirless adaptor and disable that one in your HP and you be all good to go and it will not cost you as much as if you where to replace the internal one.
- One of course is the External Wireless card you currently have
- Second, is to replace the internal card. Most laptops ahve a VERY easy to getat wireless card, and you can purchase the card on ebay for as low as 9 dollars plus shipping. Find what model laptop you have, and i'll even make a reccomenation, and show you how to access the wifi card.
Download a program called Netstumbler.
This will show if your wireless is doing anything at all firstly.
If the card is internal then check if the wireless cards antenna's are connected still. Sometimes they are not on there correctly, just sitting there and look like they are connected.
If you can see the access point with this program then check the router to see if the access method hasn't been limited locking out your card from connecting. Normally that is listed in the wireless access list by MAC address etc.
Networking is more complex then most realise, but the info above should help you to start with.
On the bottom of the laptop there will most likely be 2 panels to remove. One will be the hard drive, the other will be your RAM modules and most likely your wireless card. It'll probably be in the middle. Open this up, your wireless card will have two wires plugged into it that you'll have to unplug. Then on each side there is a tab that you have to click outward, then the card will flip up. Then you can just pull it outward. Do the reverse for installing the new card.