Blue Screen at login if printer and TM in USB ports

I recently started experiencing a bizarre problem I have never had at login after a restart or shut down. I first realized something was weird when my wireless keyboard was no longer working properly in that the bluetooth would randomly lose the signal and batteries were fresh. After purchasing a new apple keyboard I realized something was wrong with the computer itself, not the keyboard. This is what happens:
Normally when it loads up, I go to the white screen with the turn wheel, then a sky blue screen, then the login window where i enter my password and the nice leopard thing in the background, then loads my wallpaper and you know it works. But recently, the white screen stays on abnormally long then it goes to the blue screen where it gets stuck. No error messages or anything. I can't put the computer to sleep or type anything. So I pull the plug or hold the power button to restart. What I realized is that anytime something was in the USB ports, it wouldn't go past the blue screen. I was running time machine on a lacie hard drive, an HP printer, an iphone and ipod nano. The weird thing is that if just my iphone is plugged in, it will load, BUT if the printer and time machine are plugged in, it gets stuck. I tried just the printer and just the time machine separetly without the iphone, and it still does not load. Just the iPhone, it loads perfectly. When it does load I plug the time machine back in and printer back in. The printer works fine. The time machine just says preparing for about half an hour until it just says "Latest Backup: --" in the top window bar.
I did repair permissions twice, then did it with the leopard dvd, then did it on the time machine and no luck. I checked the power supply in the back and all the LED lights came on so nothing wrong with power. The Internal Hard drive doesn't sound abnormal. I checked the console during the start up period and it says a lot of these messages: "
4/1/08 12:28:51 AM com.apple.SystemStarter[18] Break on _THE_PROCESS_HAS_FORKED_AND_YOU_CANNOT_USE_THIS_COREFOUNDATION_FUNCTIONALITY___Y OU_MUST_EXEC_() to debug.
4/1/08 12:28:51 AM com.apple.SystemStarter[18] The process has forked and you cannot use this CoreFoundation functionality safely. You MUST exec().
4/1/08 12:28:51 AM com.apple.SystemStarter[18] Break on _THE_PROCESS_HAS_FORKED_AND_YOU_CANNOT_USE_THIS_COREFOUNDATION_FUNCTIONALITY___Y OU_MUST_EXEC_() to debug.
4/1/08 12:28:52 AM com.apple.launchd[1] (com.app4mac.CheckUpAgent[114]) posix_spawn("/Applications/CheckUp.app/Contents/MacOS/CheckUpAgent", ...): No such file or directory
4/1/08 12:28:52 AM com.apple.launchd[1] (com.app4mac.CheckUpAgent[114]) Exited with exit code: 1
4/1/08 12:28:52 AM com.apple.launchd[1] (com.app4mac.CheckUpAgent) Throttling respawn: Will start in 10 seconds
4/1/08 12:28:58 AM com.apple.SystemStarter[18] qmasterd: terminated due to signal().
4/1/08 12:29:02 AM com.apple.launchd[1] (com.app4mac.CheckUpAgent[116]) posix_spawn("/Applications/CheckUp.app/Contents/MacOS/CheckUpAgent", ...): No such file or directory
4/1/08 12:29:02 AM com.apple.launchd[1] (com.app4mac.CheckUpAgent[116]) Exited with exit code: 1
4/1/08 12:29:02 AM com.apple.launchd[1] (com.app4mac.CheckUpAgent) Throttling respawn: Will start in 10 seconds
4/1/08 12:29:12 AM com.apple.launchd[1] (com.app4mac.CheckUpAgent[117]) posix_spawn("/Applications/CheckUp.app/Contents/MacOS/CheckUpAgent", ...): No such file or directory
4/1/08 12:29:12 AM com.apple.launchd[1] (com.app4mac.CheckUpAgent[117]) Exited with exit code: 1
4/1/08 12:29:12 AM com.apple.launchd[1] (com.app4mac.CheckUpAgent) Throttling respawn: Will start in 10 seconds
4/1/08 12:29:13 AM com.apple.launchd[1] (com.apple.UserEventAgent-LoginWindow[82]) Exited: Terminated
4/1/08 12:29:13 AM com.apple.launchctl.Aqua[118] launchctl: Couldn't stat("/etc/machinit_peruser.d"): No such file or directory
Then it goes on and on about throttling respawn
I have iMac G5 2 GHz 1.5 GB RAM no internal isight.
If you have any suggestions I would really appreciate it.
Chris

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