On Dec 6, 2008, at 8:41 AM, Beverly Woods wrote:
> > Hi all, > > I have an iMac G5 whose AppleCare is about to expire in a few days. > For several months I have noticed that the screen flickers a bit, > intermittently, especially when just started or woken from sleep. If I > put a Finder window on the desktop and resize it, the white space in > the > window flickers, as does the dark area of the (generic default) > desktop > background, as the window is being resized. > > I talked to AppleCare and various recalibrations and tests including > Hardware Test Disk and others were run, then I took it to the local > Apple service provider but they said they could find nothing wrong > with > it. They think it's a software issue, since they said the screen did > not > flicker when booted from another iMac G5 which was in target disk mode > running Leopard. I am dubious about that since the screen flickering > issue persisted even when I had swapped in a new hard drive with a > different 10.4.11 system on it. (I have Leopard, but don't want to > install it on here since I need the G5 to run Classic. 10.4 was the > original OS of this generation of iMac.) > > So my question is: is this a familiar issue to anyone? Ideas as to > the cause or fix? > > TIA, > > Beverly > http://beverlywoods.net Did you get a case number when you talked to AppleCare? If so, don't lose it as you very likely will have to go back to Apple after your AppleCare expires. G5 iMacs have known video and power supply issues, and I'll bet that yours sooner or later will get worse. My iMac G5 went through 5 LCDs and 2 logic boards over 2 and 1/2 years before AppleCare replaced it with the current model. In addition to intermittent video flickering, at the end my iMac G5 20" had a spreading "water stain" all the way across the bottom of the screen. I also had mysterious and random shutdowns and restarts with full-speed fans. No one ever said exactly what caused my iMac's problems/symptoms, but I suspect it was related to inadequate heat management. My early 2005 Mac G5 had three temperature sensors; my late 2007 aluminum Intel iMac has 11. That simple fact tells me all I need to know about the heat problems in G5 iMacs. I've had no hardware issues with my Intel iMac, which runs cpu temps 50-60 degrees F. cooler than the G5. The sensor for the G5 cpu reported "normal" temps in the 150-160 degree F range, and it was not at all unusual to see that figure go up into the 180s and stay there during CD/DVD burning, watching downloaded video or during software update downloads, accompanied by cooling fan speed increases. I still run a ThermographX screen in the upper left corner to keep an eye on things, a habit I developed during my G5 ownership, so I know whereof I speak. Good luck, and be glad that you've registered your complaint with AppleCare before the warranty expires. If the problem worsens, you've got a legitimate and verified record of it on file. -- Jim --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to Low End Mac's iMac List, a group for those using G3, G4, G5, and Intel Core iMacs as well as Apple eMacs. The list FAQ is at http://lowendmac.com/imac/list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/imaclist?hl=en Low End Mac RSS feed at feed://lowendmac.com/feed.xml -~----------~----~----~----~------~----~------~--~---
