Computer keeps shutting down without warning

hi i have a hp Compaq PC,windows xp(don't know what model)and it keeps shutting down with any warning after a few seconds after turning on.after it makes a beeping sound and the LED shines red.we tried cleaning it from inside to see if its not overheating.Next tried to change the RAM to see what happens(this made the frequency of turning off better)but still shuts down.HELP

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What computer is it? What happens when you remove all of the RAM and start it up? Do you still get to the BIOS screen? At what point does it shut down? does it go through the POST before it shuts down?


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