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TRY AND REMOVE YOUR RAM AFTER THAT RESET THE MACHINE BY REMOVING THE SYSTEM BATTERY AND SHORT CIRCUITING THE BATTERY CONTACTS FOR 30 SECONDS MAKESURE THAT YOU'VE TAKING LAPTOP BATTERY OFF FROM THE MACHINE AFTER THAT PUT BACK THE RAM THE TRY TO SWITCH IT ON AGAIN
Have you tried to connect your laptop to external monitor?
If you get normal picture on external monitor, then you need to replace LCD screen, but if you get same picture on external screen, then unfortunately you will need new motherboard, because graphics card is integrated to motherboard.
Try using a flashlight at different angles and let me know if you can see a faint image of the desktop If so It is your inverter board that needs replaced. http://www.google.com/products?q=IBM+ThinkPad+R52+inverter&ie=utf-8&oe=utf-8&rls=org.mozilla:en-US:official&client=firefox-a&um=1&sa=X&oi=product_result_group&resnum=1&ct=title