The jumper should likely be set however the jumper on the original drive was set.
If you replaced your memory, you could try reinstalling your old module, and see if that helps.
Otherwise, just recheck that everything is seated correctly/firmly connected.
If you're still having trouble, try posting the brand, model, and capacity of your new SSD drive, and perhaps someone here will be able to advise if there is a compatibility problem with said drive.
Also perhaps worth noting, it's unlikely that PPC versions of OS X have the trim support for SSD drives. Though someone may know of a way to enable it.