I am connecting to laptop it's not working. what to do

Keyboard could need replacing. Try connecting a USB external keyboard and see if it works. If it works okay, you need to have the laptop keyboard connections checked. Replace the keyboard if connections appear to be okay.

It may have a manufacturing defect. Have you tried it on another computer? If it works on another computer, see whether it works when connected to a different USB port on the laptop. If it does, then you may have a bad or damaged USB port on the laptop. If it works on another computer but still does not work on the laptop when connected through an alternate port, then see whether some other device will work when attached to the laptop's USB port. If neither the mouse nor the other device work when connected to a USB port, then you have a problem with the USB controller. If an alternate device does work when connected to the USB ports of the laptop, and if the mouse works when connected to another computer but does not work when connected to the laptop, then you have a software problem, and probably need to change the mouse driver in a control panel or setting in the operating system of your laptop.

If the modem works and a desktop pc works through the Ethernet port of the router, then try plugging the pc laptop into the same Ethernet port using the same cable as the desktop. Most laptops have an Ethernet port.

If this works, then the problem is the wireless access?

Check you still have the wireless set-up on the pc laptop, if not re-install it.

check the configuration of your. try and configure it to be AP CLIENT. i think this would solve your problem.

Check what is the ipaddress,tried to shut down the laptop and drain flea power.Then check if the laptop can detect wireless connection. Then ping website in command prompt.Try ipconfig /release and then ipconfig /renew. Try connecting wired internet connection to check if issue with operating system or browser or wireless connectivity.

after connecting the projector just press function key and F4 . After pressing these key the projector connected automatically

have you setup the wireless connection in between the printer and the laptop...
your laptop is working wirelessly with the internet but for making the printer to use it wirelessly the printer should be also a wireless printer.

and if the printer is a wireless printer then you have to setup the connection in between the printer & laptop to work wirelessly.

first reset the connection, and try to connect the pc with switch and when net start working the connect the laptop

If it has been working before try the following:
Remove plug from your wireless DSL router for about 1 minute, reinsert the plug and try again.
Restart your laptop

Have you checked to make sure the laptop wireless NIC isn't acting as an AP by mistake? That could explain both desktop and laptop connectivity issues. Just a thought.