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Hi... If you spilled liquid on the keyboard it stops working and it has to be replaced, otherwise the keyboard unlike anything else in the laptop it does not just stop working for no reason unless the interface on the mainboard is the problem but then again if that is the case it will not be just the keyboard... You may also want to check if it is connected proberly, there should be few screws in the bottom of the laptop (not all screws) that you can remove and with a thin flat screw driver try to pull the keyboard off, be careful not to damage it or the pc and not to pull it very far, it should be somewhat attached with a wide flat cable... check the connection of that cable and maybe remove and reconnect to be sure, turn the machine on and check if anything happend... hope that helps, if not then maybe you can replace or use an external keyboard... Best of luck
First, make sure you have a wireless adapter. Not all notebooks have them and you may have to buy one.
Then make sure it is turned on and recognized by your computer.
Finally, search for the wireless network and enter the network key or password.
The person who set up the wireless network will be able to provide this if you don't have it already.
I have just done this. One needs to dismantle the laptop first. Solder a push button switch with extended wires across pins 4&5 of the serial eeprom 24c02. Then reconnect the screen, keyboard & a/c power pack. with a tooth pick press power on switch whilst holding push button on. When the factory mode screen comes on release the push button. Next go to bios setup F2 and ALT-p to the password page. Now enter your new password this will overwrite the old pass word. My approach is slightly different to this following method as it is les likely to brick the laptop. http://www.archive.org/web/2003110302606
Try to connect an external keyboard, see if that one works. If it does, then the problem is most likely a loose ribbon cable from the internal keyboard to the motherboard (especially if you recently installed a new one) - also, while you are examining the cable, look for any tears, cuts, or kinks in the cable. Good luck!
To increase or decrease the backlight brightness use Fn-key(next to left Ctrl-key) with up and down arrows.
There is not some key-combination to turn off the screen, you can make your computer turn it off after some time (if you're using XP this can be done in control panel->Power options), or just close the lid :)