Here's what happened about 15 minutes ago.
(Stranger than a UFO) this morning my screen went YELLOW after several minutes of activity. I could see nothing else and had no control, in that I couldn't shut down via a key press, nor even by holding the ON button in for more than 5 seconds. I had to switch off at the back.
On starting it up again I got a checksum error and so I just loaded the BIOS default values and it started OK. A subsequent virus and malware (quick) scan showed only a tracking cookie.
This Yellow was not mellow, and I'm wondering if anyone has any idea about it or has had a similar experience? Oh, and I was only typing some text into MSN Messenger at the time. I've now been going for longer than before. Who knows...???