MacBookPro won't restart after RAM upgrade.

Your MBP should be able to accept two 8gb sticks of ram but it sounds like either one or both of your new sticks is bad or, more likely, that the ram you purchased is not compatible with your laptop's motherboard. Just because it's the correct version of DDR does not automatically mean it will work in your computer. There are other factors like speed and latency, buffered vs nonbuffered, etc. My advice is to order your ram directly from the manufacturer and have them confirm beforehand that it's the right spec for your computer. In the meantime, just to be sure that the new ram is the problem, swap the original ram back in and see if the computer boots