MBP Startup problem - fan on, no chime; black screen, resetting SMC/PRAM doesn't help

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hi all,

i'm totally stuck here.
didn't use mid 2010 mbp (i7, 2.66 15", mavericks) 1 month while travelling , coming home wouldn't start up. battery stayed full during these 4 weeks of not using it. gets powered up, doesn't boot. fans start, no chime , screen stays black, front light goes on (first 1 second, dim). usb ports give power: connected superdrive try boot osx-dvd.
, after 25 seconds turns off.

different behaviour magsafe (the correct 85watt) connected:
when connect magsafe automatically starts without me pushing power button. after trying 25 seconds mbp turns off , restarts. endless loop this.

tried booting without ram, gave me expected beeps. tried 2 ram modules separately , switching them in slots, no solution. -> ram = ok?

tried resetting smc , pram, didn't cure it.

booting without hd doesn't work: doesn't want begin turning on.

can't startup safe mode of hardware test, because doesn't seem far enough in startup process.

i'm @ point i'm thinking baking logic board. not enthousiastic this, don't want pay €800 new logicboard , impression apple service centres replace lb when might 1 of solderings...

suggestions before these drastic measures, please?

 



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