Helping people with computers... one answer at a time.
When a monitor turns purple, the first thing to look at is the hardware. The good news is that you can test for hardware problems without spending a lot of money.
I have an LG monitor and Windows XP Professional 2002 with SP3, AMD Centron Processor LE250, with a 2.19 Ghz 896 MB of RAM. Now I face a problem: my monitor turned purple. Occasionally, it goes back to normal, but most of the time, it's purple. I use my computer rarely. There are no error messages, no magnetic fields nearby except speakers. Cables are OK. Please help me.
In this excerpt from Answercast #6, I explore various hardware issues that would make a monitor turn purple during use. Unfortunately, hardware does go bad; so that is the first place that we will look.
Even though you say the cables are OK, I'm going to strongly suggest that you check them again. In fact, I'm going to suggest that you replace them or at least temporarily replace with them a borrowed cable.
There are two very common things that can lead to what you are seeing. The cheapest one to solve is the cable. So if it's a cable problem, I really want to identify that first.
What happens is that either the cable itself is failing or the cable's connection to your PC - or the monitor - has come loose. It may have come unseated and one or more of the little pins in there (the pins that make the connections, that skip the signal out to your monitor) isn't connected or isn't connected properly.
That can quickly change the color on your monitor, especially if it is a "sometimes" kind of thing. Just wiggling a cable a little bit can make or break the connections that cause that kind of a scenario. So do that first, get another cable. Make sure it's seated properly in both the PC and the monitor and see if that doesn't solve the problem. If it doesn't, then I strongly suspect that what you have is a failing monitor.
If the monitor is roughly the same era as the Windows XP you mentioned, it's 10 years old. That's actually not a bad lifespan for a monitor, especially an old CRT. So, the easiest way to test for this is to borrow a different monitor. Go grab a friend's LCD monitor (or something that's easier to carry over to your PC) and see if it exhibits the same problems.
If it does, then you know we're talking about something entirely different. Then, you know you've probably got some kind of computer hardware problem with your video card or some kind of software configuration issue. Quite honestly, I can't - I don't a clue on that.
But what I really suspect will happen is that when you do this, the colors are going to be just fine. You're gonna end up replacing your old CRT monitor.
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