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Well, the suggestion of using a external keyboard is a good one and also the on screen keyboard also to make sure that it is not software issue. If same issue persists than you may want to try to re-seat the keyboard cable. On the bottom of your laptop the keyboard screws should be marked. If still same issue than it is your keyboard, you can get one online for about $25 depending on the model. Good luck
Here is a simple guide.
Before undertaking this operation, check the make, model and size of your laptop. Use this site to find your make and model and also check prices. Call them if you need to or email mail them for advice on your make and model of your laptop.
Frankly, it should take you less than 30mins to replace a screen.
go to the speaker icon at the bottom right of screen and left- click and then click mixer ,make sure the speaker icon is turned right up and the mute is not "checked" uncheck it.
if this fails you may have to reinstall your audio drivers
Try hooking up your lap top to an external monitor. If does the same thing, then more than likely your graphics card is shot. Unfortunately this is built into the motherboard and you will probaly have to purchase a new motherboard. There are a couple of things to try first. 1. Remove the memory and reposition and see if that helps. 2. remove hard drive and battery and try powering up.
It should say Local Area Network and Wireless network (if your card is installed properly). Right click the Wireless Network and make sure it is enabled. Then click "View Available Wireless Networks" and choose your network.
If you are trying to setup a secure wireless network, that may be a completely different issue.
HELLO. TELL ME THE COMPUTER YOU HAVE ON THE SAME WIRELESS NETWORK.! AS YOUR NEW LAP TOP.!!! IS IT A HOME TOWER.? OR DESK TOP.? OR A NOTHER LAP TOP.? AND TELL ME WHO IS THE ROUTER MADE BUY.? WHO IS THE SERVICE THAT IT CONECT'S TO.? TELL THESE THING OK.?AND WE WILL GO FROM THERE. OK.!!!