my imac has a blue tint on the screen. i don't know what happend. is the screen going or can it be fixed? please help

It depends. Check your System Preferences-Displays and be sure that under the color tab, your profile is set to iMac Display. If that doesn't correct it, in the same preference pane, look for a button to reset the display to the factory default... If all of that fails, try resetting the PRAM (restart and hold down the command(apple)-option-"P"-"R" buttons on the keyboard and listen for the startup chime 3 times... release the buttons and allow the computer to reboot normally.) Also try resetting the NVRAM. Restart the computer and hold down the command(apple)-option-"O"-"F" buttons. when a gray screen wih some writing appears enter the following: reset-nvram (press the enter key) reset-all (press the enter key) Let the system resetart and see if it is corrected. If not, take it to an Apple Store or buy a new screen. Normally the old iMacs start to turn green, but every one in a while they start turning blue or red... it is just getting old and wearing out.