How do you change the screen on a graphing calculator?

A friend of mine took my calculator and made the screen blue in the back round. how do you change it back to normal. i have a texas instruments ti 84. Please help. just give button by button instructionsHow do you change the screen on a graphing calculator?
Blue? The TI-84+ SE calculator has a monochrome display, meaning it can only display black and a few shades of gray. If you're seeing blue, then that indicates a problem with an LCD display driver.



Of course, if you just mean something like the contrast being screwed up (which I guess could look a bit blue) then just press/hold [2nd][(Up)] to make the screen darker, or press/hold [2nd][(Down)] to make it lighter.

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