Mac Pro Reboot or Restart Problems

Question

I have a Mac Pro G5 that's about 3 months old and whenever I do a reboot (either from the Apple menu or ControlAppleDelete), the MacPro immediately goes to a black screen and sounds began to emunate from the drive area like it's trying to catch. The only way to stop the sound and really reboot is to unplug the G5. Now, sometimes the warning screen appears which mentions there is like 2 minutes before it restarts, but most of the time, it doesn't even appear. Regardless if I get the warning or not, the black screen and skipping sounds always does. I've reported it Apple and they've suggested taking it into a Apple Certified Center as it's still under warrenty.
Side note: a couple times in the last few days, the G5 has gone to sleep and I could not wake it without having to unplug. Finally, I set the hard drive to Never go to Sleep in the Energy Saver prefs. I think that might be working because it hasn't happened since.
I don't think its the "85% hard drive is full" or the RAM is suspect (2 gigs installed when purchased from Apple). It's perplexing. We have an identical G5 in the office that is perhaps 2 months older and it doesn't do this when I've tested it.
While I don't reboot or restart often, my concern is the problem could began to surface on initial start ups. I'm waiting for the local Apple store to return my call but I thought I'd check with a Discussion Thread as well. Thanks for your time!

Answer 1

+Do those items point to something you installed or use? Aladdin?+
The only tie to Aladdin I can find is StuffIt Expander, which I don't believe I installed directly on this Mac Pro. However, I did check the Startup Script on my current G4 Mac and it does include the reference to Aladdin in the Startup and on the G4, it says it was successful. On this Mac Pro, it states it was not.
+There are three tabs in Disk Warrior. Directory you can hold OPTION and it changes to REBUILD... and then you can click on SCAVENGE. There is a file repair tab. And you can manually check hard drive status. I would not use anything extra for drive status and smart. Too many of a good thing.+
I have already rebuilt the Directory with Disk Warrior. Should I do it again using the OPTION>SCAVENGE approach?
+When you click on manual drive check, it writes to the system log what the count of bad blocks used, attempts, and stuff.+
I did the manual drive check but cannot seem to find the system log related to logging this actual event. However, the description box did say the drive checked out okay.
+I do think it needs some bench time with AppleCare as to what is up.+
I tend to agree. It would ease my mind knowing that someone who can read these System logs might be able to decipher these log events. A couple of things I'm wondering could be causing some problems: about the time all this reboot issues had started, I had manually changed my Computer Name in the Sharing pane of System prefs. But its my understanding this is where I could change it without causing any issues. Secondly, I had recently downloaded and installed a mp3 encoding program called iLas, as a alternative to the iTunes so-so mp3 encoder. It does tend to run from an AppleScript-- could this be a culprit?
Thanks again for your help!