Dell 3000 monitor is blank

I have a Dell Dimension 3000 PC. I have replaced the motherboard, reseated all plugs, reset the CMOS, tested the PSU, removed the board memory one by one then replaced, checked the monitor on another computer (worked fine) and I still cannot get anything to show on the monitor. It turns on briefly then goes into power saving mode with a flashing power button. Any other suggestions?
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  1. Hi :)

    Its NOT the monitor (as it works with another machine)

    Its the main tower unit....

    All the best Brett :)
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