Dead laptop - why ? How to diagnose ?

I have a Sony Vaio FX501 which had a bad disk.  I opened it up and fixed the disk, but when reassembled the on/off switch has absolutely no effect.  I did forget to remove the battery initially; could I have shorted something ?  I have checked all connectors and wires and nothing is loose.  I have reseated the obvious ribon cables.  The same lack of responce is apparent whether connected to the mains adapter or just battery only.
Thanks
MM
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EugeneGardnerAsked:
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EugeneGardnerAuthor Commented:
I have a working Vaio F409.  Are there any components I can switch to isolate the problem ?
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nobusCommented:
Yes : Ram, disk, CD drive, fan , keyboard.  You can look here for opening your laptop

http://repair4laptop.org/disassembly_sony.html
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David523Commented:
The above recommendation from nobus is Excellent!  If after doing those parts exchange and if nothing is found two sources of a completely dead machine - ie no signs of life at all - are the Power Supply and the Motherboard. As you test parts, above, be sure to test power source into the system.  If everything test out then the motherboard is a strong candidate for the problem.  When opening a system a multitude of possible problems can be created and you may never know what the actual source was.

Hope this Helps!!!
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PCBONEZCommented:
I'm suggesting this because you just had it apart.......

Laptop switches are generally activated by some plastic piece in a cover of some kind.
I have had situations where, when the cover isn't installed just so, the switch didn't get pushed in far enough to turn the laptop on.
In one case I had to shim the switch 1/16th of an inch 'up' because the PCB the switch was mounted on was warped just enough that the plastic piece wouldn't push it in far enough to turn on. (1/16th of an inch made a difference!!)

Try pushing the on/off switch directly and not through the intermediate parts.
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EugeneGardnerAuthor Commented:
Thanks for posts.  Nobus, your fine reputation caused me to try your suggestions despite not thinking any would cause a complete absence of any activity at all.  Alas, no joy.
David523, I agree those are the likely culprits (mobo or PSU) but I have not been able to find complete disassembly instructions.
Pcbonez, a very good suggestion. Not appropriate in this case however as the on/off switch is electronic.  However I did have exactly the same issue with a plastic switch on an Acer laptop last week.

I have taken the PC to someone more knowledgeable (and expensive) than I, who thinks he has resolved the problem by replacing a transistor on the mobo.  That would be beyond my capabilities.
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David523Commented:
:-)
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EugeneGardnerAuthor Commented:
As the poser of the question, I don't think the answer was given by anyone.  The replacing of a diode or something on the mobo was the solution.

I would like the points to be placed in a charity pot - something like the 'need a penny - take a penny' jars in shops.  Anyone who is down on their luck and low on points would be able to dip in to ask a question to save their hiney.

Eugene.
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David523Commented:
:-(   ?
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David523Commented:
Hmmmmmm - Bad Motherboard, where have I heard that before????????  LOL
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PCBONEZCommented:
I have to agree with David523..
If a diode was replaced than the motherboard had repairs done. - Bad motherboard.
- Bad motherboard was suggested..
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David523Commented:
Eh, no problem.  Guess we must be Very Specific, Exact!  Gosh, recieving points is going to really a challenge in its self!!  LOL
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David523Commented:
Thank You  :-)
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nobusCommented:
i thought the question was how to diagnose, and i told him exactly how   :-(
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EugeneGardnerAuthor Commented:
Guys, we're talking about 100 EE points here.
The answer to the question: "could I have shorted something ?" was plainly (in retrospect) 'yes'.
IMO no one answered the question.  David523 did get closest (and did make the most noise) by saying that "if everything test out then the motherboard is a strong candidate for the problem", so I gave the points to him.
Nobus, as I said previously, I only followed your recommendations due to the fine reputation you have, I really didn't/don't think the Ram, disk, CD drive, fan, or keyboard could possibly cause a completely dead system; and so concentrating on those was not, I believe, furthering the trail to the conclusion.
I regret any :-( I have caused, as I like to spread :-) wherever I go.
Eugene.
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nobusCommented:
you did ask also : "Are there any components I can switch to isolate the problem ?" which i believe i answered fully. i do not care for points, but i do like to be treate right . . No problems
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