If your computer is working fine outside of your monitor displaying everything with a red tint, you have a problem with your computer's outgoing video signal. In many cases, the red screen is caused by a poorly connected or damaged monitor cable and not a failing piece of hardware. The bad connection problem isn't limited to just red: it can also show up in blue and green. The steps to fix the problem are the same regardless of the over-present color.

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LED Screen
Computer screens might take on a red tint when there's a signal problem.

Step
Power cycle both the computer and monitor. Rebooting the computer is a general fix that resolves many system problems and flukes.

Step
Jiggle the monitor cable on both ends of the connections and check if the tint returns to the normal color. The problem could be as simple as an unaligned or loose connection. Also disconnect and reconnect both ends of the monitor cable to resolve poor connection problems.

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