My iMac has a blue screen, but no desktop.. SOS!!

So here's my problem,
Lately my iMac has been acting a little funny and sometimes when it gets super slow, I restart it.
The OS loads super fast but when it comes to the Blue screen, up in the corner only the spotlight icon loads up, everything else is blank. It's like my OS isn't properly booting or my hardrive isn't mounting.
I've run several hardware tests and everything is fine. I even dusted out my computer thinking that it was over heating.
Now, it's been almost two days and it will not start up. My computer just stays on the blue screen with just the spotlight part of the tool bar showing.
Can anyone help me figure this out??

If it's gotten past the hardware tests (assuming you mean the ones on your Install disks) then assume for now that the problem lies in the OS rather than the hardware. That means, for one thing, that you're actually in the wrong forum and should be moving over to the Mac OS X v10.4 Tiger section, probably the Installation & Setup forum you'll find there.
On the way, take a look at the contents of the following KB article. It will get you started on the troubleshooting of this problem, and reporting what you've done from here (and what the results were) will speed the process in the other forum.
See http://docs.info.apple.com/article.html?artnum=25392

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My iMac has a blue screen, but no desktop.. SOS!!

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