Probably nothing - but when it
does go pop, you're going to open it up, and there's the world's tiniest circuit board, with 100 tiny little capacitors, and if you're old enough to remember the Amiga then they are all too small for your eyes to even see. There are 3 chips, and each chip has 700 pins, and each pin is ~0.5mm from the next. What is the difference between your laptop, model 344 revision 001, and another laptop, model 344, revision 002? - oh dear, the answer is:
everything. They redesigned the whole thing. Still, at least you didn't get revision 003, which is not only entirely different again but also coated in epoxy resin!
Meanwhile, your Amiga has this enormous motherboard that's full of DIP-size ICs, many of them socketed, and even with your schoolboy soldering you can extract the ones that ain't. And it almost cetainly doesn't matter if you're hoping to get their replacements from an Amiga that's completely different, because Commodore just didn't have the money to make N different versions of their chips, even assuming you're trying to replace the custom ones in the first place.
Or was it just the disk drive that fucked up, or one of the power supply capacitors, or something like that? - well, why didn't you say! No problem. Plenty of those about!
P.S.: but, all that said: what I was thinking about, when it comes to a modern desktop, is that you'd just replace parts as much as possible, repairing things as required, then when it finally dies just buy another one and restore from your last backup. But while bench repair is more of an option with a desktop than a laptop, in either case you probalby wouldn't actually bother, and you'd just throw it away and buy a new one at the first sign of trouble. So in fact, maybe it doesn't make much of a difference overall.