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Check the monitor cable for missing or bent pins. If you find any bent pins try to carefully bend them back. If they are broken or lodged in the computer or monitor plug you may have to replace the plug.
Move the cable around while the monitor is on to see if moving the cable has any effect on the color. This will indicate if there is internal damage to the cable. Internal damage will require professional repair.
If you are still missing the red channell no matter what you do with the cable the problem is likely to be in the monitor which will need professional repair.
If you want to make sure it is the monitor, not the computer, with the problem try using another monitor.
You should make sure the cable is plugged into the video port on the back of the tower. Also, if you have more than one video card, ie an "onboard card" and another card that was added later, try alternating one to the other and see if the other one works. You can identify video ports by finding the blue pentagonal plug. It also will be the only plug that your monitor cable fits into (that is describing a VGA cable, a white cable is a DVI cable and is even easier to identify.) You might also want to make sure the video card wasnt jostled out of place. The final solution could be you have developed some bad memory modules, or the memory was jostled out of its slot during the move.