Remove the new ram, re-install the old ram and power up. Your laptop may only be powering up but not getting to POST. This will prove you haven't broken anything, yet.
Assuming your memory upgrade consists of 2 separate sticks, proceed to install one at a time and power up after each is installed (install first, power up, remove first, install second, repeat).
note:-The new memory modules should have matching latencies and should not be any bigger 4GB each.