Hi Adrian, Not good news I'm afraid. This is possibly a fault in the LCD screen, this has been a problem with the older iMacs, and unfortunately for your daughter the extended service program ended some time back.
Fault in the LCD screen. <http://www.flickr.com/photos/imac_faulty_screen/> A Google search brings up a huge amount of people who have had this problem. <http://www.google.com.au/search?q=thin+red+line+on+Screen+of+21-inch+iMac%3F&ie=UTF-8&oe=UTF-8&hl=en&client=safari> I hope this is not the cause as it will get worse over time. Cheers, Ronni Sent from Ronni's iPad On 19/02/2012, at 8:49 PM, cm <cm200...@gmail.com> wrote: > Hi Adrian, > > Most monitors have a warranty against a certain number of dead pixels within > a certain timeframe but a thin red line does not sound like dead pixels. A > dead pixel is usually the loss of one of the three colours of the > red-green-blue trio (RGB) within a single pixel. The closely related cousin > the stuck pixel is where one of these three colours stays on. A dead pixel, > unless there is systematic damage of some sort, is an isolated point at a > random position on your screen. > > There is software around to test screens and show up dead pixels, usually by > flashing colours and black up on the screen and asking you to look for > irregularities. A quick search turned this up but I have not tried it and do > not endorse it in any way: > > http://www.macupdate.com/app/mac/7669/pixel-tester > > If the problem is still there when you run the above software, or similar, it > is likely hardware related and the Apple Store would likely be interested in > it and may repair it for free. > > Cheers, > Carlo > > On 19/02/2012, at 20:31 , Adrian Skehan wrote: > >> Good evening all >> >> I was at my daughters place this afternoon and noticed that a thin red line >> had appeared on her iMac screen, it is on the left side about 15mm in and >> extends from just below centre to the bottom of the screen. I presume this >> is a dead pixel. It is a 21" iMac about 12 or 13 months old so is probably >> out of warranty, as usual she forgot to take up the Apple Care warranty. >> Can anyone advise if Apple may be, even remotely, interested in this problem >> or does she just suck it up and put up with it. >> >> >> >> >> Regards, >> >> >> Adrian >> >> adrianske...@me.com >> >> >> >> >> -- The WA Macintosh User Group Mailing List -- >> Archives - <http://www.wamug.org.au/mailinglist/archives.shtml> >> Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml> >> Settings & Unsubscribe - >> <http://lists.wamug.org.au/listinfo/wamug.org.au-wamug> > > -- The WA Macintosh User Group Mailing List -- > Archives - <http://www.wamug.org.au/mailinglist/archives.shtml> > Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml> > Settings & Unsubscribe - > <http://lists.wamug.org.au/listinfo/wamug.org.au-wamug> -- The WA Macintosh User Group Mailing List -- Archives - <http://www.wamug.org.au/mailinglist/archives.shtml> Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml> Settings & Unsubscribe - <http://lists.wamug.org.au/listinfo/wamug.org.au-wamug>
