Sounds like the gpu is on it's way out. It could be worth taking it out and giving it (and the rest of the insides of the g5) a good clean though, and making sure everything is seated properly when you put it back together. Other things I'd test, in no particular order: 1-a different display, ideally with a different interface (assuming the card has a dvi and a VGA port). It could be a wonky connection 2-try the defective card in the other G5, just to try and isolate it to that component, rather than something on the logic board 3-try the good gpu in the new G5
On 16 Dec 2010, at 18:19, Tom <[email protected]> wrote: > We have two G5s in our family. I have one, and I just got my wife one, > too, off Ebay. My G5 had a 23-inch Apple Cinema Display (the old type > with the acrylic plastic frame and legs) connected to it for the last > couple of years and it worked fine. My G5 has the GeForce 6600 video > card with 256 MB of VRAM. It gave me a choice of 17 different > resolutions on that big monitor, up to 1920 X 1200. > > I gave the Cinema Display to my wife to use with her "new" G5. Hers > came with the ATI Radeon 9600 video card, which also has 256 MB of > VRAM. However, her G5 is only offering her one resolution: 1920 X > 1200. Furthermore, big blocks of pixels, which look like big single > megapixels about an eighth of inch square, appear at random all over > the screen of the display, which never happened when it was connected > to my G5. All it takes to get rid of one of these "giant pixels" is to > swipe the cursor across it and it vanishes, but it's a real nuisance. > They pop up within windows, within dialogue boxes, everywhere. > > My question is, does this sound like a defective video card in her > machine? The person who sold us the G5 on Ebay said that this card > could drive a 30-inch Apple display. All I can say is, it isn't > working so well with this 23-incher. > > I want to get rid of these sprinklings of "giant pixels" on her screen > and also give her a choice of more resolutions. Should I get a new > video card for her G5? If so, what would be a good card to look for? > > Tom > > -- > You received this message because you are a member of G-Group, a group for > those using G3, G4, and G5 desktop Macs - with a particular focus on Power > Macs. > The list FAQ is at http://lowendmac.com/lists/g-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] > For more options, visit this group at http://groups.google.com/group/g3-5-list -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-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] For more options, visit this group at http://groups.google.com/group/g3-5-list
