USB buss and monitor not being detected

I've been having an issue this last week, where when I start up my Mac Pro does not output video. Judging by the hard disk sounds, it is booting up, but it doesn't detect the video. I think there is an issue with the USB bus, because if I remove all usb devices (including the keyboard) when it boots up it will send video to the monitor.
I've felt since I bought the computer that something hasn't been right with the usb system, it isn't entirely hot pluggable as it should be, and sometimes some peripherals seems to be competing for resources, i.e. if I hook up a phone to sync via USB my USB midi system will won't be detected. Since Snow Leopard these issues have gotten worse, but it could just be coincidence and be an underlying hardware failure that has chosen become worse.
The times when the monitor isn't being sent video, if I press any key on the keyboard it will make a clicking sound through the built-in speaker.
Anyone experience anything similar? I would run the hardware diagnostic utility, but because I need to hold down the 'd' key on the keyboard, and having anything plugged into USB prevents it from detecting the monitor I can't run it. Thanks.
Message was edited by: Eugene Scalisi

Hello Eugene,
Interesting - possible - coincidence. I just posted about a similar seeming issue here:
<http://discussions.apple.com/thread.jspa?messageID=10425731#10425731>
Notice that I've checked Disk Utility's repairs report as well as the System Log with Console: both show mention of USB related items.
This may not have anything to do with your issue but I thought it worth mentioning.

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