A symbol or a letter appearing without touching it can be an indacation that you have a sticky key. try pressing your shift key 4 to 5 times and the stickey window will come up. uncheck all the boxes. if none of the boxes are check then it could be a defective keyboard. try booting your computer when you see the dell splash screen press f12 then go to boot to utility partition then go to diagnostic tree and select keyboard. better if your system is still under warranty just call dell for keyboard replacement. you can reach me at this number 18002643355 ext 6125624
I've worked on a lot of the CPX machines and never encountered this issue. Can you use the cursor when it does this and does it eventually go back to the way it should be? Try checking and cleaning the connector, it's under the keyboard. To remove the keyboard, take out the screws on te bottom of the machine marked with a K. Then take a small screwdriver and lift one side of the keyboard, at this point it should lift up, keep in mind that it's still connected to the board, so lift gently.
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