Startup - Black Screen

Just wondering if anyone else is having a problem when they start their iMac? Recently i have noticed that after i push the power button i get the start-up noise as normal but nothing actually happens on the display - then after about twenty seconds the grey apple screen appears witht the revolving cog and the rest of startup is as normal.
I cant quite say when it first happened as i rarely shutdown my comp but i first noticed it after installing the new itunes and quicktime (after system restart). I have repaired permission and have cocktail so have executed daily, weekly and monthly maintenance etc.
Any help would be greatly appreciated! I may just be over-worrying but i just thought i would check.
Garry
imac g5   Mac OS X (10.4.7)  

Garry - I had exactly this problem recently and nailed it down to a problem with one of my USB peripherals plugged into my hub.
Here's the thread:
http://discussions.apple.com/thread.jspa?threadID=641973&tstart=50
Have also since discovered that rather than having to start up in safe mode to see what's going on, if you open up Console and then look at the system log you may see an entry something like:
localhost kernel: USBF: 71.947 AppleUSBEHCI[0x1c93800]::MakeDevice error setting address. err=0xe000404b device=0x2389d00 - releasing device
that repeats for the duration of your Black Screen during start up, indicating that the problem lies with a USB device or its driver.
Anyway - cure for me was simply unplugging the device and reinstalling the drivers. First thing just unplug everything except for keyboard and mouse and see if that sppeds things up, then go looking for the problem device.
Neil

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    Thanks for the reply. I looked at the plist, but the -v was not there. Here is a copy of the plist:
    <?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
    <plist version="1.0">
    <dict>
    <key>Kernel Flags</key>
    <string></string>
    </dict>
    </plist>
    At least I know what it is called now - a "verbose startup".
    Again, thanks for the help. Learn something new every day.

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