G5 fans running and making loud noise before crashing

I was out of town so this description was second hand but the computer has been running a little weird for a while. When I have too many apps open or on a website that has a lot going on...the computer starts revving up until I quit out of everything and let it slow down. I guess while I was gone, this happened but nobody quit out the apps and it eventually turned the screen black. When I tried restarting it sounds like the computer is working but the screen is black so I can't see if it is booting up or not. I took the monitor into the apple store yesterday and it started up right away for them. It's a cinema 23" I think. Anyway, I will take the computer in today but was wondering if there was any thoughts on what might be the problem or anything else I should try before going in. Just hoping and praying I haven't lost any data. Thanks for your time and help!

Try a Safe Mode boot. Hold Shift while starting.
If you get to your desktop, it may be that the graphics card is bad. Safe mode unloads graphics drivers, so the display can work without stressing the graphics card.
As an added benefit, Safe mode forces repairs to the hard drive directory, should the issue lie there.
If you get to the desktop in Safe mode, but a subsequent normal boot shows a black screen again, you will then want to test the machine using the Apple Hardware Test that is on the original OS software discs. This can help pinpoint hardware issues.

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