Crownclown wroteI just came back from the store that I bought my laptop from and he just said that motherboard is a goner.
thats what all of them said when my cousins laptop died, until i shoved it in the oven ;)
besides, its usually not a motherboard problem, people who can't figure it out or just want to make a few bucks lie to you saying its the board, just a few weeks ago there was someone who's laptop was busted too, he said he took it to a repairman and the guy said its the motherboard and asked for 300 bucks to change it...i changed the adapter and it worked like a charm
leaving it on all night? nah, won't harm it, but i think leaving the power cord on all night will