It really doesn't sound like anything is
fried yet. It sounds to me like you are simply inexperienced, and have damaged things instead of trying to put them together correctly.
I suspect that if you get undamaged, working DDR3, and correctly install it, the system may actually work.
However, this begs the question, was there anything wrong with the system before you started tinkering with it?
If you're going to borrow a memory module from somebody, I hope you take the time and care necessary to ensure correct installation into the motherboard, so you don't damage anything further. If you're unsure of what you're doing or unable to find the patience, maybe have somebody more experienced perform the work.
Did you move around, bump, disconnect, or otherwise modify the system when you opened it to install the RAM?
DDR3 Installation Video
Remember, if the notch in the card edge connector does not line up in the slot, you have the wrong orientation or wrong part. Incorrect or backward memory modules will never work in a RAM slot, so whether you can force fit them or not, it is pointless. Also, the latches on the memory slot need to be in the open position before inserting the RAM. They usually close on their own when the module is correctly inserted, but may need to be clicked closed the last millimeter or so to fully grasp the module.