A) It's lazyB) Too tiredC) It's TuesdayD) The ATX Power On switch is bad, or the Power Supply.Suggest you diagnose by bypassing the Power On switch.Has nothing to do with the Power On switch, or it's wires. A jumper wire is used on the Soft Power On wire to ANY Ground wire.The eMachines W3653 Desktop PC uses an ECS 945GCT-M3 motherboard,
http://support.gateway.com/s/MOTHERBD/Shared/4006188R/4006188Rnv.shtmlUses a 24-pin ATX main power cable,
http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain24[Note* Color of connectors does not matter ]Note the Green wire going into the back of the power cable's connector. This is the Soft Power On wire. (Abbreviated PS_ON)Note all the Black wires. ALL Black wires are Ground wires.The preferred jumper wire is a straightened out paper clip, then bent into a U-shape.The top of the U is wrapped a few times with black plastic electrical tape. This taped area is for your fingers and thumb to hold onto.Turn the U-shaped jumper wire upside down, and the 'legs' are what is used.One leg goes down into a socket hole with the Green wire.The wires go down into the Back of the power cable's connector.Down into socket holes in the connector.The jumper wire 'leg' goes down into the back of the connector, RIGHT NEXT TO the Green wire, and slides down in the socket hole past the insulation of the wire.The jumper wire MUST go down far enough in the socket hole, to touch the metal terminal.Every wire going into the 24-pin ATX main power cable's connector, ends in a metal terminal,
http://www.molex.com/molex/products/datasheet.jsp?part=active/0002081202_CRIMP_TERMINALS.xml&channel=Products&Lang=en-USThe other 'leg' of the jumper wire goes down into the back of the power cable connector, and into ANY socket hole that has a Black wire in it. ALL Black wires are Ground wires.The contact made is no more than 2 seconds.The Power On switch is Momentary Contact Switch.IF the Power Supply comes on you have a bad $5 Power On switch.IF the Power Supply does Not come on you have a bad Power Supply.
http://www.directron.com/atxswitch.htmlFor additional questions please post in a Comment.Regards,joecoolvette