IMac G5 screen goes black and fan gets loud...?

This has never happened before...
Randomly tonight while on my iMac the screen shut off. The computer was still running, but my screen was completely black like it was off, and the fan got really loud. I turned it off then back on each time it happened (3 times), and it would turn back on like nothings wrong but then after probably 30min. of using it... it would happen again.
Any idea what it could be? This had never happened before, and I couldn't find a whole lot on google.

"my problem might have to do with overheat and/or I might need to "vacuum" part of my mac. No idea how to do this and I'd like instructions on how."
Since the iSight cannot be taken apart unless you take it to an AASP, the only thing you can do is use a vacuum hose specifically one w/a brush on the end so as not to scuff up the plastic. Just run the hose over all the computer vents.
Make sure your computer is OFF when doing the above.
Also, when troubleshooting, disconnect all devices from your computer except for the keyboard & mouse.
Move the computer to a less dusty place and/or move it where the computer can get plenty of ventilation.
You mentioned that you read rockstar's post. Therefore, please advise all the troubleshooting suggestions that you have already tried. This will eliminate all the +"been there, done that"+ scenarios. Thank you.

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I am forced to shut down via the power button. When I try to restart, the beeping occurs again, and the monitor light remains orange.
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I will run PC Doctor and clean the dust out of the fans, etc.
But I do not have a lot of money to just randomly go about replacing parts. Does anyone have any idea what is the most likely culprit?
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This shows how to get inside: http://h10032.www1.hp.com/ctg/Manual/c00225826.pdf
If you have never done something like this before, maybe enlist a friend to help. I suggest you not remove the CPU heat sink if that chore is not a task done before, at least without a knowledgeable friend along.
{---------- Please click the "Thumbs Up" to say thanks for helping.
Please click "Accept As Solution" if my help has solved your problem. ----------}
This is a user supported forum. I am a volunteer and I do not work for HP.

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I recently received the Portege M400 from a friend 4 days ago and reformatted to Windows XP Tablet edition.
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Hi there,
I have the same laptop. Bought it from a friend also! That was a year ago. It was working perfectly till 6 months ago when I had it going 100% like yours. Screen freezes, fan speeds up and hangs up once it is moved. Recently, even if it doesnt move it hangs up also. I have tried many things like reinstalling drivers and Windows.....etc.
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IMac G5 screen goes black and fan gets loud...?

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