On Saturday, December 7, 2002, at 05:06 PM, David M. Ensteness wrote: > I thought that might be the case but the processor card snaps in > tightly and I have tried reseating it a number of times. > > The G4 boots up and runs as normal as soon as I replace the 800 with > the OEM 466. > > David > > OS X News, Dr.Mac, Forums, Tutorials, Tips, Hints, FAQ?s - > http://www.osxfaq.com > > try it with the other video card, and check to make sure none of the pins are bent on the processor card. I did the same upgrade but was able to find a DA 733Mhz card. I had no problems at all. Everything I've read indicates the quick silver card should work. I think the QS card was larger and had an extra hole for an additional standoff. Maybe make sure that that there isn't extra pressure flexing the card because of the lack of the extra standoff for support. Also check that the heat sink clips are on correctly and not shorting something out. vern.