Whenever I try to boot my MacBook, it chimes and shows the apple logo & loading gear like normal, but then the screen goes blue briefly as if everything is fine (sometimes the mouse even appears) but then returns to the loading gear (without an Apple logo). This continues without end, a brief blue screen and then the loading gear again. I tried safe booting, zapping the PRAM, fsck, and the Disk Utility repair to no avail. Trying to verify or repair the permissions in Disk Utility stops with a nondescript error. When I try booting in verbose mode, it gets to the login application startup and shows 2 apparent errors: "(Error) Import: importer;0x88fe00 importer start failed for 89 (kr:268435459 (ipc/send) invalid destination port)" and something containing "(/usr/sbin/mDNSResponder) no such file or directory" For reference, this is a MacBook running OSX 10.5.4. Any help is appreciated, I hope I don't have to do a reinstall. Thanks in advance!