My Casio CTK-496 Keyboard has three keys (2nd octave F sharp, G, and G sharp that don't play anymore. How do I fix this?

http://support.casio.com/en/manual/manual.php?cid=008

You have to install the MIDI type software in the PC to trigger the sound card's voices. You may also need a driver for the keyboard. Search the Casio site for downloads pertaining to your keyboard.

Sorry, but many of the low end keyboards do NOT have backlights. This is especially true of those that have the capability of running off batteries like the CTK-496.

The display in this is a reflectance type that needs ambient lighting to view.

In Casio Chord mode, the bottom keys up to the second F plays Bass Chords. The Keyboard is just putting the keys you play back into bass when you get up that high. If you read along the plastic edge above where they keys come out of the keyboard, it shows you where the Chord keys end and the Keyboard begins. If you want use of all the Octaves, slide the power switch to the first setting (normal).

Unfortunately your model of Casio only has midi in and not midi out. You will be able to use it as an external sound module but not to input notes into Fruity Loops. In other words midi out of your computer to midi in of the Casio with the proper settings will play your Fruity Loops sequences through the Casio.

Try downloading MidiOx and troubleshooting with it. It will show you if you have any midi activity and which channel your Casio is transmitting on etc.

Turn the keyboard off, unplug it, take out the batteries. MAKE SURE YOU DO THIS STEP BEFORE PROCEEDING! Remove the metal plate under the octave you are having trouble with. Get a can of compressed air, and GENTLY use it to blow out the strike pads (the part of the white key that hits the computer board) Reassemble and power it on.

Try uninstalling and reinstalling both the keyboard and the game. If that doesn't work then the keyboard may not be compatible with the software.

According to the manual for the 496, "All keyboard settings are returned to their initial defaults whenever keyboard power is turned back on after being turned off by operation of the Power/Mode switch or Auto Power Off.

Unplugging and taking batteries out for 15 minutes should reset it back to factory.