TravelMate 4740-5261 no Power

Hello,
I have a Acer TravelMate 4740 that will not power up.
I've tried the static power down, replace memory modules, tested and verified power coming from power adapter, it does charge the battery.
There is power going into the Motherboard via adapter, and battery. I've even replaced the powerboard switch (no luck).
Does any one have ideas or options I can try?

 

If it doesn't power up at all, i'd say mb. If you do get to bios we can explore other options.

 

Is there a sure fire way to prove that the MB is bad? It is an expensive part for a "maybe" the MB...and find out it's not the problem.

 

Does anything happen when you turn on power? HD or dvd spin up or anything else? If not it couldn't possibly be anything else since you allready checked psu and powerswitch and learned that the power goes in to mb.
That said, the only sure fire way to prove the mb is bad would be to take it to a repairshop, and even they get it wrong sometimes.

 

Nothing...the only response is when I jump pins 1 and 2 on the motherboard, where the powerboard switch connects, The L.E.D. lights come on. Using a Volt meter shows that there is power going thru the MB, it just dosen't power anything up enough to turn it on....
That was my next guess (Motherboard) Thanks for your feedback greveakira

 

Last check. You get power in to mb, but do you get the right amount? If not you could be lucky and just have a faulty psu.

 

I do have the proper power readings to the mb
There are 10 pins that connect from the MB to the powerboard via a ribbon.
Pins 1, 3,4,5,6,7,8,9 all give 0 volts
Pin 2 gives me 2.8v
Pin 3 gives 3.4v
Pin 10 gives 5.1v
When I jump pins 1-2 the MB LED comes on, and on the powerboard when I jump pins 8,9,10 the power board LED comes on.

Also last time I was putting it back together...the LCD flashed power...no picture...as I connected it back to the MB...
Another guess could it be the CPU?

 

Thanks for your help...issue resolved
reset the cmos battery allow me to power up the laptop.
lesson learned, never overlook the simplest things