I don't know much about hardware so am looking for possible reasons as to why my laptop would suddenly create a large plume of black smoke and switch itself off. It smelt vaguely of burning chemicals or rubber. The hard drive looks fine and apart from some slightly blackened dust on the fans I can't see anything inside that is burned (although I can't get to a lot of it).
I have tried switching it on again once after the incident but the power light came on for a second and then went off, and there was a small puff of smoke and smell of burning.
What are the possibilities here? I can't really afford to take it to a repair place unless I absolutely have to because I'm skint and they generally want £200 before they've even opened it up. If it's something obvious I'd rather have a go at repairing it myself.