Very slow starting iMac

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iMac G5 iSight (bought Nov '05), 2.1Ghz, 1.5Gb ram, 500Gb hard drive (378.83 available), nothing connected to it except keyboard and mouse (which is connected to the keyboard). Start up items: PSPWareHelper, Microsoft Database, Aspyer Game Agent Helper, iCalAlarmScheduler, iTunesHelper (I have now removed the first three).
The problem seems to be when starting up after being off overnight. The wife called me Monday lunchtime to say she had started the iMac up only to get the grey screen with the Apple logo (no little circle going round below it) and that's all she got, after a couple of minutes she tried turning it off by holding the power button for a few seconds but it wouldn't respond so she switched it off at the wall, left it a couple of minutes and then tried again, this time it started up but it took about 7 minutes before all was working OK. She then shut down as you normally would and then turned it on again and it was up and running in what we would consider a normal time scale (about a minute and a half).
The same thing happened yesterday (long start up followed by a normal start up, no sticking on the grey screen this time). I decided to start it up myself this morning to see for myself and I got the seven minute start up which just seemed to be a very slow motion version of the normal start up, once you do get the normal desktop the first thing to appear is the dock followed by the top left hand information (blue apple and finder 'tabs') then after about two minutes the hard drive icon appears followed quickly by the top right hand information. For the next few minutes everything I clicked on (email, blue apple to access the System Preferences) was followed by the spinning beach ball.
When the wife first told me about the problem I ran disk utility and repaired permissions and MacJanitor (all tasks) but neither has made any difference. My next stop is to install TechTool Deluxe that came with my AppleCare (does anyone else use this programme? is it any good) and I have just read in the latest Mac User about FSCK but I'm not sure I have the confidence at this stage.
I must say that once the iMac is up and running everything works normally.
The most recent programme I have installed is Transmit (off of the MacFormat cover disc) but that has been installed for about a week before the problem started.
Has anyone experienced this problem? Does anyone have any ideas what I should be looking into.
Andy

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"My next stop is to install TechTool Deluxe that came with my AppleCare (does anyone else use this programme? is it any good)"
Yes. However, the disc that came w/AppleCare is not compatible w/your model G5 iMac. You will need to contact AppleCare. They will refer you to a link for you to download & burn v.3.0.4
See Knowledge Base Article: http://docs.info.apple.com/article.html?artnum=301353 Mac OS X 10.4: Don't use Tech Tool Deluxe 3.0.3's Volume Structure repair
Because I notified them of the problem back when I purchased my computer last November, AC made arraingements w/Micromat & sent me TTPro for free.
Regarding fsck, see the following article:
http://docs.info.apple.com/article.html?artnum=106214 Using Disk Utility and fsck to resolve startup issues or perform disk maintenance
=====================
Now regarding your other problem(s):
Sounds like you basically did a lot of troubleshooting. Have you tried running Disk Utility from the DVD?
Do you have any other 3rd party disc utilities besides TTD? If not, you may want to purchase Techtool Pro. If you do, you will be able to purchase at a DEEP DISCOUNT because you already own Deluxe.
Another "forum" favorite is DiskWarrior.
You may have tried some of the following. However, there may have been some suggestions you could have overlooked:
http://docs.info.apple.com/article.html?artnum=301287 My computer stops responding during startup
Mac 101 Lesson 1: Computer Crises
Click on a topic link that pertains to your situation(s).

November 30, -0001

Very slow starting iMac

iMac G5 iSight (bought Nov '05), 2.1Ghz, 1.5Gb ram, 500Gb hard drive (378.83 available), nothing connected to it except keyboard and mouse (which is connected to the keyboard). Start up items: PSPWareHelper, Microsoft Database, Aspyer Game Agent Help

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