Sony Vaio VGN-NW20EF power problem, lights on front blink on momentarily.

I've a UK Sony Vaio VGN-NW20EF that won't start up.

Power block & power cable are working OK.

I have removed RAM, HD & CD/DVD drive to eliminate those.

1) With power disconnected, I have removed battery & hold power button down for 10 seconds (to reset PMU ?)

2) When I then connect battery & power the orange battery light on the front comes on & remains on .... until ...

3) When I then try to power on the laptop the green mains power light at the front also comes on for one second then goes out, as does the orange battery light and it will remain dead until I go back to step 1.

Any ideas most gratefully received ! Thanks.
SeafoodITAsked:
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Gerwin Jansen, EE MVEConnect With a Mentor Topic Advisor Commented:
Power supply and cable are OK, you say.

Just to be sure: are you able to try (or already tried) another power supply?
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Gerwin Jansen, EE MVETopic Advisor Commented:
Could be the battery is dead and because of that it won't charge.

Can you try the notebook without the battery installed?
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SeafoodITAuthor Commented:
Thanks for the tip :-)

Without battery installed, both orange (battery) and green (power) lights momentarily blink on when I power it on ... then both go off ..... and nothing happens.

I can reset PMU by disconecting power and holding power button for 10 secs again but then I'm back to square 1.
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Gerwin Jansen, EE MVETopic Advisor Commented:
When did these problems start to occur? I've had a similar issue with a notebook that wouldn't charge/boot/startup because the charging circuitry on the m/b was fried. Nothing much to do about that (besides replacing m/b which is usually quite expensive).
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SeafoodITAuthor Commented:
Seems to have just randomly occurred .... think it could be beyond help .....
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nobusCommented:
i 'll try to give you some answers, but first how do you know "Power block & power cable are working OK" ??

all laptops i know do work from AC adapter, without battery in even, so, if that does not work, you may have a bad AC adapter, - or cable, or a loose DC input jack

>>  , I have removed battery & hold power button down for 10  sec  <<   this is for bleeding away residual electricity
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