I have an iMac g4 800mhz, 768 mb of ram 40 gb internal HD and 250 gb external HD. I plan on upgrading to Tiger this wednesday. Also, my mac has been a bit quirky over the last year or so. The internal HD seems to almost spin constantly. It spins and spins....spins down, then right back up again. Weird. Once in a while the apps act strange as well. So, I plan on doing a clean install of Tiger. Everything is backed up on the external HD. My question is, does anybody know how Tiger will run on my system? Will doing a clean install eliminate these "quirks"? And finally, will quicktime 7 finally run smooth with the upgrade? Right now, Quicktime isn't as smooth as it used to be with Quicktime 6. Thanks for your help people! And thank YOU Apple for eliminating firewire so that the case could be 1/32 of an inch smaller and now my iPod transfers take hours!