Advent 3218 wont turn on

  andymac1 12:19 07 Dec 2008

I’ve a problem with my computer when you turn it on nothing comes up on the screen. Also, sometimes it beeps for about 2 seconds every 5 seconds. I've changed the graphics card and checked the RAM and sometimes that fixes it but when you try to turn it on again it doesn't work. It's an Advent 3218 with 3000+ amd athlon xp processor and 512mb ddr-ram memory, it has an nVidia GeForce FX 5200 256MB graphic card if that helps.
It's a Phoenix D686 bios chip. It gives one continuous beep for about 1-2 seconds and then again every 5 seconds. It doesn't beep every time it starts up, sometimes it gets to the checking memory screen and stops, sometimes the windows loading screen comes up and then stops, or like this morning, and everything works fine. Then it switches off suddenly for no reason and it is like above but on the bios beeps web sites it does not say about a continual beep.
further more it will only turn off by the power button on the back.

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