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i have a Dell Optiplex 755 when i turn it on i just get a flashing orange light from the power button.

I know there is power going to the motherboard as there is an orange light that is on.

i have tried a power flush and changed the power supply and flushed the cmos but it still flashes orange and wont boot up the machine.

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up vote 1 down vote accepted

On Dell's Optiplex series, if the power button is flashing amber, that indicates a power supply problem. However, you said you replaced the power supply... If you are sure the power supply you put in was good, then unfortunately your motherboard is probably dead.

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thanks. I thought might be motherboard but was hoping it wouldn't be – ben950 Feb 25 '13 at 12:27

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