Hi I'm a newbie to this forum so, please accept apologies in advance for any posting which is not appropriate. Configuration: Please see attachment for System Profile information. The machine has two internal drives; the original Apple included 250 GB ST3250820AS P and a 500 GB Seagate ST3500320AS which I added. The 250 GB boots Tiger which had not been used regularly for a while and was patched last Friday to 10.4.11. It seems like the symptom became worse after the patching on the Tiger drive. The 500 GB drive runs Leopard which is patched regularly and currently is at 10.5.6. Symptoms: Machine particularly after sitting overnight will not boot up. Sometimes it makes it to the login prompt sometimes it does not. It usually presents itself with an incomplete graphics character screen (missing pieces), squiggly changing graphic characters, or graphic characters that look similar to a test mode program. The same problem can occur during a "wakeup" from sleep mode with the machine idle for several minutes. The length of time appears to track linearly to the problem. I have occasionally allowed the machine to "self heal". After 20 minutes the machine will eventually come on line usually only to repeat the same process during the next boot. Workaround: When this occurs the only way to get the machine back on line quickly is to boot Tiger (Command-c) during boot and run Disk Utility -> Repair disk against the 500 GB drive. I do hear disk thrashing while the problem is occurring which led me to suspect an unclean shutdown but I believe that the thrashing can also occur during a re-indexing operation for Spotlight. After the disk repair is completed the OS will come on line. When OX 10.5 is online if I remember to run a Disk Repair against the 10.4 drive and boot from the 10.4 drive I can reduce this startup fiasco. Machine Usage: Primarily web cruising, streaming video from Television programs (which I'm suspicious may have contributed if not caused the problem) and Logic Pro. Fixes Attempted: CTRL-v during startup to look at messages Console troubleshooting Disk Repair both Permissions and fsck Extensive Hardware Diagnostics from Install DVD Firmware upgrade on Seagate 500 GB Clearing download lists from Firefox (primary browser) and Safari Zapping PRAM Cache removal from Firefox Removal of Spotlight Indices sudo mdutil -E / System Logs from both OSs are attached. I'll crack the case today and see if something is loose but I'm running out of options. Thanks for any help.