4 year laptop would not have much value bro but if the mobo s fried u can get the Processor, memory, hard drive, cd/dvd drive(most likely cd drive on 4 yr old lappy though).
I d doubt even if u ll be able to get the parts for it either or use the above said stuff anywhere. U shud have done this long ago (4 years to be precise :-p), but still there is a chance that ur screen might be salvagable, keypad etc.
As far as ur power up is concerned it sounds like ur mobo is a goner. So u ll have to replace that to get it working. Its unlikely that u ll find the exact replacement but alternatives would surely be out there somewhere which might help u to get it back to life again. Then again some or most of the parts may not work with the newer mobo so make sure that everything is compatible hardware wise. Good luck.
Regards
Raj