Computer turning on for 1 second then turning off...

When i press the power button on my computer it turns on for one second then turns off and repeats this until i manually turn the power supply switch off. It beeps once every 2 times it turns on.I just replaced the power supply because i thought that might be the problem but it wasn't. Any suggestions would be great?
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  1. Best answer
    It maybe the cables are not connected securely, check that they are fitted properly.
    IF they are fine, the RAM might be causing it, boot the computer with one ram stick.
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