Very loud fan sound, can't get video, system still running...help?

I can't seem to find an answer to this anywhere here or throughout google. Can't find a similar problem.
We have a G4 tower here at work that we run FileMaker server on. It pretty much just sits there and we all connect to it remotely and use the FileMaker on our own machines. It's usually not even touched unless Filemaker needs to be restarted or something along those lines. It shares a monitor with another system so its not usually even connected to a monitor.
Well - today there is a loud fan noise coming from it that we havent heard before. So we went to hook up the monitor and can't get any video. It was fine in the past week or so because we have been on it with the monitor.
FileMaker must still be running fine because we can still connect...for now...but we can't load up a screen to properly shut down, or run the backup or anything to safely turn the machine off. I am not sure which OS is currently installed because I can't get to that info.
Our guess is that the video card died, and that is the video card fan spinning...but if that were the case, would the software running still be fine like it is?
Any help would be greatly appreciated. Our tech guy can't make it out until tomorrow morning and we're afraid to have to wait that long...
Thanks in advance!

G4 tower covers a lot of G4s; it would help to have more specific model information. I think some of the later ones (not my DP800 QS) had software controlled fans. It's possible part of the operating system has crashed and the fan is automatically going into full speed to automatically prevent overheating. The rest of the OS may still be running and explaining why you can get to your files. I'm not sure about the video though. Perhaps somebody else has something more constructive but with that kind of thing I can't help but feel you'll just have to switch off the machine and restart it.
Message was edited by: Limnos

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