Macbook shuts down when moved?!?

okay whenever i move my white macbook core duo 1.83 ghz it shuts down, it only started a few days ago, i opened it and unplugged the inverter board and plugged it back in and it works, but when i move the monitor fast or move the left side of the macbook it shuts down and i cannot restart it unless i unplug the AC adapter and unplug the battery for a few seconds, then it restarts, but i have to keep it in a stationary place or it wont work, im out of apple care and dont have money for expensive parts, what should i do? btw im on the macbook right now, but its on my table.