My PowerBook AL 17" high res also has colored lines.

My PowerBook AL 17" high res also has colored lines. Is it the inverter or the video cable which is bad? It works okay when plugged into an external monitor (see pictures below).

Block Image

Block Image

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crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0