2nd monitor ACER LCD suddenly red

Second monitor, an ACER AL1916W flat screen LCD, is far in the red spectrum suddenly. Haven't changed anything. Was working fine for the two weeks since we got the Macpro.
This occurred right after reinstalling OSX, which reformatted the disk. (We have a key assignment problem we are in the middle of troubleshooting.) There was no other software on this computer other than OSX when the problem started. Now have the mac applications disk installed. Currently installing Studio 2.
Connections seem good. Plugged into second video card from bottom as before. Don't want to try another card.
Using 1360x768, the default setting.
Color settings set to Adobe RBG (1998), which is a little less brilliant than the Cinema HD display setting. Using it for the Acer and the Cinema HD display.

My cable had a bad connection. This is an old serial adapter. Maybe I'll try to fix it myself, since I'm not sure if a store would even carry one.
Fumble with the cables to see if it corrects the problem. Check all connections carefully.
Years ago I remember throwing out monitors that went red like this. Good thing I didn't toss this one.
Hope this helps someone. That's what tech forum should be all about.

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