For basic of the keyboard or computer case cleaning a little isopropyl (rubbing) alcohol on a paper towel or soft cloth works well. Common household cleaners like Formula 409 also do a nice job. Use cleaners lightly and make sure no liquid gets under keys. Use a can of compressed air to clean out all the dust bunnies that have mated and grown and had children and mated again and built apartment complexes and shopping malls inside your keyboard. Finally if you spilled Mountain Dew, coffee or some other liquid substance into the keyboard, contact the tech department for assistance.
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Unlike the standard CRT monitors with Glass screens, you are not advised to clean an LCD Monitor by wiping it with a piece of dry lint-free cloth since the sensitive display is likely to get scratches from dust particles. Think of LCD Displays just like the soft and delicate skin of your newborn baby - Be very gentle and never put even the slightest pressure on the computer screen with your hand. Unlike a computer monitor, the LCD / flat-panel display is not made of glass, therefore requires special cleaning procedures.
When cleaning the LCD screen it is important to remember to not spray any liquids onto the LCD directly, press gently while cleaning, and do not use a paper towel as it may cause the LCD to become scratched.
To clean the LCD screen we recommend that you use a non-rugged microfiber cloth, soft cotton cloth, or Swiffer duster. If a dry cloth does not completely clean the screen, you can apply rubbing alcohol to the cloth and wipe the screen with the damp cloth. Rubbing alcohol is actually used to clean the LCD before it leaves the factory.
The newer optical mouse is much more accurate than the ordinary mechanical mouse that relies on the traction between the mouse ball and the rollers. One drawback to an optical mouse is they can have problems in bright lights.
Use a cloth moistened with rubbing alcohol or warm water and rub the surface of the mouse and each of its buttons.
If liquid is spilled on your computer immediately pull out the battery and disconnect AC power as you tilt the laptop or computer to the side so that most liquid will drain it off
If you can't make a connection, open Internet Connect in the Applications folder, click AirPort, and make sure that the dialog shows that AirPort is on. If it's off, click Turn AirPort On. Alternatively, if you've opted to display the AirPort menu in your menu bar, click the AirPort menu icon and be sure that AirPort: On is displayed in the menu. If not, choose Turn AirPort On.
Check Your Physical Location
Being free from wires doesn't mean that you can go anywhere and still get a connection. The maximum theoretical range of a wireless network is 150 feet, but range can vary based on your environment. If your connection seems spotty, make sure that there are no metal objects in the path between your computer and your base station or wireless access point. Try moving closer to your base station. Be aware that certain electrical items such as power lines, railroad tracks, and power stations, can cause communication interference—and try to avoid life situations that have you working behind concrete barriers or bullet-proof glass, both of which can impede your reception.
Restart Your Base Station or Wireless Router
Try restarting your base station or router by turning it off, waiting a few seconds, and then turning it back on. Or unplug the power cord, wait a few seconds, and then plug the cord back in. Then try connecting again.
Restart Your Computer
Sometimes a simple restart can clear up issues. From the Apple menu, choose Restart and restart your computer. Once it's finished starting up, try connecting to the network again.