I have a first gen iBook G4 12". It is in great shape, but came to me with no battery, and the hard drive had been smashed somehow so needed replaced. When I got it, I noticed it has 256MB onboard RAM and a 1GB stick. Cool. I installed a working HDD and installed Tiger. Within 5 minutes or so of being on, it freezes. I let it stay off for a while, it will work a few minutes again. If I try to turn it on again right away though, it only gets half way through booting. I know this sounds to be heat related, but the bottom of the laptop isn't even close to being a little warm. I suspected that it could be the HDD cable that connects it to the logicboard. It routes under the HDD and I figured it may have been damaged when the HDD was pinched. I replaced the HDD cable and used another known good HDD. I then tried to install Panther. It only got half way into install before freezing. Not the HDD, HDD Cable, or OS Disc causing this as they have now been ruled out. I did have the bottom cover off when trying to install Panther. I never saw the fan kick on, yet I suspect it is because the laptop did not warm up enough to warrant any fan usage. Again, it was not even a little bit warm before freezing. When it freezes, the screen stays on but everything is completely locked up. Most recent freeze I noticed the display freeze a good 10 -15 seconds before the CDROM stopped reading and accessing data on the install disc. (ie: computer was "froze" but CDROM still seemed to be operating). Then it too silenced and stopped working. Any ideas what could be wrong? I know this had the BGA issue, but from what I have ready, that presents itself with different symptoms and issues, no? (Namely, NO video at all, or artifacting). Dustin edit: I will add that I tried running the machine with only the onboard RAM, same issues. Also tried with an without the AirPort Extreme card installed, same results as well.