Dual G5 won't boot with printer plugged in to 23" Apple Cinema Display

I shut down my Dual G5 the other day due to the excessive
heat it throws out as we were having someone stay in our guest room.
Upon restart next day it would not boot up entirely it would get
to the apple screen with start up wheel (not beachball)
then it would go to a blue screen and stay.
I have cross eliminated the problem to a print device
that I had plugged into the back of the 23" Apple Cinema Display.
I merely unplugged the usb and the computer finished loading up.
I have a slimline keyboard plugged into monitor as well and that does not seem
to cause any problems. Has any one had this problem and or a fix.
Thanks in advance,
Sean

Hi, and a Warm Welcome to Apple Discussions and the Power Mac G5 Forum!
Well - presuming that you have inspected the tab on the locating peg of the air deflector for damage - shown in Figure 4 here
http://www.info.apple.com/usen/cip/pdf/g5/073-0891.pdf
and that the booting ok without the deflector, and then running ok with the deflector is a repeatable symptom - there is some discussion of a similar-ish problem here
http://discussions.apple.com/message.jspa?messageID=5748156#5748156
The theory there was that 10.4.10 was picking up on a (real or imagined) CPU-Logic Board mismatch - which may have continued into 10.5.1. As suggested, this may be able to be verified by checking the entries in system.log. If nothing in the log catches the eye, you could copy and post the Startup sequence entries.
There are some things to try suggested there; running the Apple Service Diagnostic is a possible as you still have AppleCare. It would be interesting to hear what they think is the problem.
Please post again if you have any questions. Good Luck.

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