Hi Perry, I can guarantee that a properly installed upgrade (as I'm certain yours is) will not have an issue with Mac OS X. I believe the only truly incompatible upgrades are pre-G3 systems upgraded with G3 or G4 upgrades. Apple likely doesn't "support" the use of third-party upgrades in newer Macs, but the software will run with them. I have a Mac Mini system disc (10.3) that doesn't want to boot with anything else either, and at this time my Mini is dead. It's a shame I can't use my licensed OS and iApps on another system - this OEM system disc nonsense can truly be frustrating. I have two copies of Tiger at the moment, if I can locate them both. One I got before the Mini retail, the other was bundled with it at Best Buy, who decided to take a short break from their PC-onlyness, just as they'd done when I got my bondi blue iMac. Eric On Sun, 2007-06-17 at 14:57 +0100, Perry Mitchell wrote: > I've successfully upgraded my DP450 G4 to DP1.2GHz G4 via a PowerLogix > processor kit. I've also got a later Video card. It's all working fine on OS > 10.3.9 > > My question is whether I can now install Tiger? The OWC site (who sell > PowerLogix) clearly say compatible with OS 10.4 but the Apple site clearly > says that OS X is not compatible with processor upgrades! > Before I lay out the UKP89 (that's about $180!) for the retail version of > Tiger, I wanted some reassurance from somebody that it would really work? > > I have access to an OEM version of Tiger sold with a G5 that I was hoping to > use to test the system, but it won't load on the G4. > > Perry > > _______________________________________________ > G4 mailing list > G4 at listserver.themacintoshguy.com > http://listserver.themacintoshguy.com/mailman/listinfo/g4 > > Listmom is trying to clean out his closets! Vintage Mac and random stuff: > http://search.ebay.com/_W0QQsassZmacguy1984 >