It may be the case that one or both of the RAM slots have failed. If you haven’t already, you should try testing the system with only one RAM stick installed, first in one slot, then in the other. Then repeat with the other stick. If any of those configurations work, try to deduce whether or not you have a failed RAM slot, bad memory stick, or larger issue such as general logic board failure.
Also it would be good to verify the style of beeps you are getting at startup. You can use this reference. There are two types of startup tones that give 3 beeps and it’s important to distinguish between them.
crwdns2934105:0crwdne2934105:0
crwdns2934113:0crwdne2934113:0
crwdns2915270:0crwdne2915270:0
crwdns2889612:0crwdne2889612:0
0
crwdns2944067:02crwdne2944067:0
Are you sure you have the correct RAM?
Reference: MacBook Pro: How to remove or install memory
Does an external display show the same lines? If not then the internal display will need to be replaced.
crwdns2934271:0crwdnd2934271:0 Dan crwdne2934271:0
Thanks Dan, yes I have the correct ram. I will try with an external monitor once I get it going.
crwdns2934271:0crwdnd2934271:0 robert.monty crwdne2934271:0