Emachine t2885 front panel came off and the power pins came out of the mb and I don't know the order the pw .sw .hdd. Go can some one help me

On the connector side should be a red wire (the red wire will be pin 1)
Look on the board (will be small) look for a #1 somewhere next to the pins and that is the end that the red wire would go

Hopefully this will help, if not in manual could be trial and error