viau, you CAN'T put them backwards, it's physically impossible they do not fit unless the board or sticks are physically different.
That chip having been damaged when the problem occurred does not mean _IT_ is the fault. If you can't read or identify the chip then you're out of luck. More than likeley a short circuit was caused that the board couldn't deal with and the regulator or pass transistor fried, good chance it fried other thing with it.
You can try to find a replacement chip if you can identify the part number or find out from the maker of the board what it is, but it's delicate matter to remove and solder something like that to a high density board like a motherboard. There's very little chance of the motherboard every working again.