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Thanks for your advise help...I'll try this option hoping works for me too... Thank you anyway

Please help me mac pro 3.1 does not start the led of the start button is always on. When I try to start I see the video card fan on.... the red lights of the ram on and a red light on the motherboard on...... in a fews second ...and then everything shuts down After 24/48 ours my mac start on...