D845epi mobo has flashing green light after power supply replacement

Unplug the power then unplug the 24 pin power connection from the mother board and take paper clip bend it so you can insert it into the holes where the green and the black wire are next to each other, Next you will need a multi meter. Set the multi meter to read dc volts 20 take the red lead and put it into the purple wire hole of the 24 pin connection and the black lead in to the hole with the Black wire on the 24 pin connection. the reading on the Multi meter should read 5.0 volts if it does not and you get a reading of 6.01 or higher then the Mother board has been burnt out and you will need to replace the motherboard and power supply I have been a onsite tech for E-machine for the last 5 years and this has been an ongoing problem with the power supply.