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There are a couple solutions to this problem that many other people have claimed worked for them, here's a list of the most common solutions;
1. First the wireless button at the top of the keyboard didn't work even though when pushed an icon popped up saying it was "ON". The five bar wireles icon still had an X in it indicating no connection. I used Fn F8 and that didn't work at first either. However, I did FN F8 again and noticed a round icon pops up just below the rectangular F8 icon, and it says wifi on it. Mouse over that and you find it is another on/off button. I clicked on it, and the red x on the wifi icon went away and all worked again.
2 All I did was pull out the battery for 5 minutes and the wifi started working on the next restart.
There may be a switch on the side of the laptop that turns the wireless on and off. Also try pressing and holding the fn key and pressing and releasing f1 or f2. The water spill may have killed the wireless card also. If you still can't get it working, then purchase an inexpensive usb wireless adapter. This will plug into an available usb port and will give you wireles capabilities. You will need to replace the keyboard as well as it was obviously damaged by the spill. Check on ebay, or contact the manufacturer for a replacement.
There is no physical wireles switch on your laptop. You should however, be able to hold down the "fn" key at bottom left of the keyboard and then hit the F2 key at top left to turn your wireless on or off. If that does not provide the desired effect, then your wireles adapter may be disabled, in which case you should right click on the wireless icon in the bottom right system tray and choose "Repair" or "Enable".
Do as I did. Get a 5 dollar wired keyboard and put the Logitech wireles keyboard in the garbage can where it belongs. I can't start describing the many problems I had with it. The mouse went the same way weeks earlier.
It appears that you have an IBM desktop whose BIOS isn't capable of booting off of a USB keyboard and mouse device. Older computers used to require that a PS2 mouse and keyboard be attached before booting, to prevent you from booting a machine without any way of controlling it. You have 3 options:
1. leave the corded mouse and keyboard attached and never use them
2. update the BIOS for your desktop to the newest one in hopes that the updated BIOS will allow for USB mouse and keyboard operation
3. go to a computer store and get a PS2 to USB converter/adapter. They're small and relatively inexpensive. It plugs into the PS2 port, and makes your computer think that there's a PS2 device connected, when it's actually a USB device.
Typically there is a tiny switch or button which lets you turn off the wireless capability manually - for "protection" in certain circumstances. You probably accidentally flipped this switch, pressed the button, etc. These are HARD to find but if you look carefully around the edges, and study the buttons you never use and don't know what they do, you'll find it.
go to device manager and see if your wireless network adapter is enabled (right click) then go to the network connection in control panel and run the setup internet connection then choose the wireless option then just follow instructions. hope this helps