First post, by nonpayer

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I have a problem with my old PC and I'm looking for someone who can help.
After switching PC on, the computer emits only a long, regular beep of about 2 seconds with about 5 second intervals (I would compare it to the sound of a burst from a machine gun). 3 years ago, when I last turned it on, it worked. I searched almost all available manuals about this computer, but to no avail.
The beeping is constant whether I turn on the PC without all the additional cards or with them. I tried to replace the processor with a different one, to no avail.
I think that the motherboard will not be dead, because it would not make any sound.