EMac wont power up after DVD update

I updated my dads combo drive to a superdrive today in his emac, something i do all the time with other computers no problem. Once the drive was installed i put it all back together and powerd it up, thing is, it wont, when i plug the kettle lead in i can hear something inside but nothing more. i have rememberd to re plug the switch plug back in too. Can anyone offer advice on to what might have happend hear? i occured to me that the removal of dust from the system might have done something as there was an obscene amount in there.

Does the front power LED light up? Does the fan come on? Removing dust from a power-down eMac shouldn't cause probelms. Tedious through it may be, you're first recourse would be to take the eMac apart again and double-check that all the connectors are, in fact, fully seated. Especially check that the pins in the power button connector aren't bent.

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