On Oct 4, 2004, at 5:16 PM, Kevin Willis wrote: I have a 400 Mhz Gigabit G4. When I bought it (used) I put a PCI ATI Radeon 7000 video card in it. I left the 16 mb AGP card that came with the system in it, although it is not being used. I haven't had any problems with the system until now. I installed a 1 Ghz Sonnet Encore card last weekend, and I have been having a lot of trouble keeping this thing up and running. I keep having apps. lock up, kernel panics etc. I am wondering if there might be a conflict with the CPU dealing with the 2 video cards in the system. Could that be the case? Should I pull the AGP card and leave that part of the case open until can afford a good AGP card? BTW, I am running OS 10.3.5 with 1 Gb of RAM. I really doubt that you are having trouble because of the two video cards. Your setup sounds identical to mine, except for the troubles you seem to be having. My G4 was also a 400MHz Gbit model until I upgraded to 800MHz and then 1GHz Sonnet cards. My G4 Gbit is just sailing along without any real problems at all these days. I never noticed any problems with having two video cards (the same models you have) installed except that I had to select the correct monitor for my menu bar and icons to be visible on the desktop. How did you arrive at OS-X.3.5? I did the upgrade from OS-9.2.2 to OS-X, OS-X.1, OS-X.2, and now OS-X.3.5 in increments, not as a single upgrade step. After each upgrade, I went through the steps to rebuild the desktop file and repair permissions. All these upgrades were AFTER installing the 1Gb RAM and trouble-shooting a couple of non-compatible RAM sticks. The RAM sticks just refused to show up in the Get Info window or System Profiler. Since I put in all compatible sticks, they all show up and perform like they are supposed to. I suggest running some utility program like Cron or MacJanitor and repairing the permissions as a first step to try. Good luck.