Ok i made this a while back for my friend, so here's a quick troubleshoot:
Solution 1
The RAM is not seated properly! This could be the reason that your laptop is not booting up after upgrading with a new memory module. I faced exactly the same problem initially. Following are a few simple steps to insert the new memory module(RAM) properly.
Once you have removed the old RAM and ready to insert or install the new RAM, then the most important thing you need to know is that the angle at which you insert the new RAM. Most of them who are new to installing RAM tend to insert ram in a horizontal / completely flat direction, which is a wrong method; because, in this way, the RAM doesn't get into its place, no matter with how much pressure you push it in.
The correct method is to insert it at an angle of 30-50 degrees. Tilt the RAM slowly at an angle of 30 degrees while inserting the RAM and when properly positioned, it will get in easily and instantly. It is after this that you need to press the RAM down firmly so that it's placed within the retaining clips firmly. Now put back the battery, plug in the power cord and turn on your system. You will now notice the system will boot up successfully without blinking of two lights.
Solution 2
Swapping the RAM from one to another has worked for many. If you have two slots then swap one to another and try rebooting.
Solution 3
Either the slot or the RAM could be faulty. In order to check this, lets start with RAM. In order to know whether the RAM is at fault or not, try inserting the RAM in the other slot, if it works properly from another slot, then the problem is with the first slot. Second possibility is that the RAM itself is damaged. Insert the RAM in the other slot and boot up the system, if you still get the same blinking caps lock and lock button error, then probably the ram is damaged.
Apart from the above fixes, there could be other issues as well depending upon the brand and models of various laptops. However, the solution is the same for all models, provided you are facing aforementioned problem. If nothing works for you, then explain the problem, you are facing in the comments section below.