PETER WARNER wrote: > I recently (about 2 months ago) upgraded my video card to a Radeon 9800 > Pro Mac Edition. I had a 16" Dell CRT that I found in the trash 4 years > ago... But it worked fine with the original Rage 128. When the 9800 was > installed, I had problems with random pixels, or blocks of pixels > blacking out, or shifting slightly to one side or the other. This would > sometimes be how a page rendered, but then I would get intermittent > 'flashes' where it would shift more dramatically. Sometimes scrolling, > or selecting text would clear it up temporarily, until the next 'flash'. > > I tried re-seating the video card, and RAM, and made sure that the power > was firmly connected to the card. This had no effect. > ... > > I went back to work, and borrowed an old 14" HP CRT that was collecting > dust in the basement. When I hooked it up, it worked fine, without any > of the pixel issues. So I assumed that they were some how related to the > dying CRT. However, the tiny, super low res screen was frustrating > everyone, even my 6 year old was bothered by it. So I went looking. I > thought it was time for me to get up to date with the rest of the world, > and get an LCD. Staples had an Acer 18.5" Widescreen on clearance, so I > splurged today, and actually spent money on a monitor (something I have > not ever done before... I like the trash) > > The pixel problem was back, with a vengeance! It is worse than it ever > was on the Dell CRT. But my Kids wanted to watch Star Wars, and I had to > get to work, so I got the Movie going for them. Here is the weirdest > part, When it is playing a video, the problem happens much /less, /and > when using VLC, especially in fullscreen, it is almost gone! I had > noticed this on the other monitor, but since it is so bad on this one, > it seems like a much more dramatic shift. > > Any Ideas?
Yeah, your 9800 is buggered. The problem didn't show with the older CRT either because the lower resolution was less taxing on the video processor or because the lower resolution meant it didn't get far enough into the video memory to hit some bad bits. Here's a simple test, reduce the resolution on the LCD to something akin to the old CRT's. > Here are my specs: > > G4 Gigabit Ethernet Dual 450 > 1 Gig of matched RAM (4...@256 PC 133-333) > 6 port PCI USB 2 card > USB devices are mostly powered, or on a powered hub > Acer X183H 1360x768 @ 60Hz 18.5" WS monitor > ATI Radeon 9800 Pro, Mac Edition (not flashed PC version), ROM > revision 113-A07525-114 > OS 10.4.11 -- Clark Martin Redwood City, CA, USA Macintosh / Internet Consulting "I'm a designated driver on the Information Super Highway" --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
