black screen and the startup sound continuously...

my imac 24" debut 2008 2.8 ghz

Hello,

my iMac starts with black screen and the startup sound continues in every 3 seconds.

Led light 1 and 2

Led 3et4 does not light

I joined you a vidéo.

Help me please

http://sendvid.com/4wd9h6yc

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