replacing g4 14" 1 gHZ logic board with 1.42 gHZ

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Joined: Mar 7 2007
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Hi I've been cruising the web for ibook HW info (originally to fix my wife's ibook) and this forum seems the best one out there. I've made this into a bit of a hobby (addiction) and now I've bought a broken 14" G4 1gHZ that I want to replace with a (good?) 1.42 gHZ 14" logic board. The two questions I have (I already have it apart) are: 1) Is there any way to tell whether the logic board is good before putting it in?
and 2) I notice quite a few differences - CD/DVD cable, video inverter cable, modem ... I wonder if this is more trouble than it's worth. Has any one done this swap?