Booting i7 iMac - Can't Get past "white screen" unless i unplug peripherals

This has been an intermittent but regular problem recently. upon startup, my iMac gets hung at the white screen. unless i unplug my external drives, usb devices and monitor. didn't happen for the first couple of months with this machine, but recently it's been driving me crazy.
any ideas?

Great answer i think, but this is jibberish to me. mean anything to you?
5/19/10 10:57:25 AM com.apple.launchd[1] * launchd[1] has started up. *
5/19/10 10:57:39 AM com.apple.SystemStarter[32] /Library/StartupItems/Digidesign Mbox 2/Digidesign Mbox 2:start
5/19/10 10:57:39 AM com.apple.SystemStarter[32] Starting Digidesign Mbox 2 Configuration Service
5/19/10 10:57:39 AM com.apple.SystemStarter[32] Requesting load of /System/Library/Extensions/DigiIO.kext.
5/19/10 10:57:39 AM com.apple.SystemStarter[32] PACESupport - launchd already started us
5/19/10 10:57:39 AM com.apple.SystemStarter[32] /System/Library/Extensions/DigiIO.kext loaded successfully (or already loaded).
5/19/10 10:57:39 AM com.apple.SystemStarter[32] Requesting load of /System/Library/Extensions/DigiDal.kext.
5/19/10 10:57:39 AM com.apple.SystemStarter[32] /System/Library/Extensions/DigiDal.kext loaded successfully (or already loaded).
5/19/10 10:57:40 AM com.apple.SystemStarter[32] Starting Qmaster services
5/19/10 10:57:41 AM com.digidesign.fwfamily.helper[54] Wed May 19 10:57:41 Jon-Chases-iMac.local DigidesignFireWireHelper[54] <Warning>: 3891612: (CGSLookupServerRootPort) Untrusted apps are not allowed to connect to or launch Window Server before login.
5/19/10 10:57:41 AM com.digidesign.fwfamily.helper[54] Wed May 19 10:57:41 Jon-Chases-iMac.local DigidesignFireWireHelper[54] <Error>: kCGErrorRangeCheck: On-demand launch of the Window Server is allowed for root user only.
5/19/10 10:57:41 AM com.digidesign.fwfamily.helper[54] Wed May 19 10:57:41 Jon-Chases-iMac.local DigidesignFireWireHelper[54] <Error>: kCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint() to catch errors as they are logged.
5/19/10 10:57:42 AM com.digidesign.fwfamily.helper[54] _RegisterApplication(), FAILED TO establish the default connection to the WindowServer, _CGSDefaultConnection() is NULL.
5/19/10 10:57:43 AM com.apple.audio.coreaudiod[92] Wed May 19 10:57:43 Jon-Chases-iMac.local coreaudiod[92] <Error>: kCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint() to catch errors as they are logged.
5/19/10 10:57:43 AM com.apple.audio.coreaudiod[92] coreaudiod: _RegisterApplication(), FAILED TO establish the default connection to the WindowServer, _CGSDefaultConnection() is NULL.
5/19/10 10:57:43 AM com.apple.audio.coreaudiod[92] _RegisterApplication(), FAILED TO establish the default connection to the WindowServer, _CGSDefaultConnection() is NULL.

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Welcome to Apple Support Communities.
Sounds like it could be a problem with the hard disk.
You can diagnose and perhaps repair the problem (if the hard disk still runs, but has errors) with these instructions:
http://support.apple.com/kb/ts1417
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http://support.apple.com/kb/DL1433
and
http://www.apple.com/macosx/recovery/
Message was edited by: kostby

IMac can't get past grey screen...

This all happened when I was creating an Image of an OS 10.4 dmg file. as soon as it finished different items began disappearing from the top Finder bar. Soon as I restarted I couldn't get past the gray screen with spinning thingy.
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_Reset the SMC controller by unplugging everything from the iMac for at least 15 seconds, and then powering back up with just the keyboard connected to it.
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_It won't let me boot into safe mode. (when i hold Shift down the Apple comes up but I get a circle with a diagonal line going thru it (like the no-smoking sign) flashing back and forth between that and the Apple logo until I let go of the Shift key.
__booted by holding down option, was able to select my Hard Drive {(apparently it still recognizes my HD (i.e. M. Scorsese icon)} but still won't work
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http://support.apple.com/kb/TS1417
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