PC monitors have changed to a green-ish colour.

  Ian in Northampton 18:46 29 Dec 2014

The symptoms you describe are typical of a loose-fitting cable (or a problem with one of the cable sockets). The cable transmits red, green and blue on different channels via the connector to the cable, and if one or more of those isn;'t making proper contact, you'll see the symptoms you describe. The fact that it first happened after you'd unplugged a cable tends to confirm the diagnosis.

Btw: what do you mean by "downloaded a graphics card from the Intel web site"? Unless things have moved on a long way since I last looked, it's still not possible to have hardware delivered via the Internet...

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