Screen goes black and I get steady beeps

I have a 2004 HP Pavilion a600n, AMD processor with Window XP SP3 and 1 gb of ram. I have no viruses or spyware due to running McAfee, Malwarebytes, Spybot, Spyware Blaster, and Advanced System care.
My pc starts fine, but after about an hour, the screen goes black, and I get a series of steady beeps about a second long. There are no short, long beeps. Just steady short beeps and a black screen.
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.
I will let my pc sit for a day or two, and I can start it back up, the monitor light is green then, but after an hour, the whole process starts over.
I have no way of knowing if it's ram, video, or fans. My video is built into the motherboard.
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?
Thank you in advance for any help.
Kaat1220

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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