How to keep it running with cover off (to track down noise)

My Mac Pro started making a weird hum; I suspect one of the drives is vibrating a bit. I'd like to take the cover off and see if I can figure out what's responsible for the noise but this means I have to keep it running with the cover off and that plastic air guide out. Is that possible or is it likely to hurt it somehow? Is there a better way of figuring out what's humming?
Mike

Sorry, but what "plastic air guide"? Are you sure you're not referring to a PowerMac G5? Those do have a transparent plastic air guide that had to be in place for the system to run without ramping up the fans to maximum?
Regards.
(Sorry, Brian, this is a bit redundant; I missed your reference to the G5 on first reading).
Message was edited by: Dave Sawyer

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