So i have an extra og xbox that i used to replace the drive in another. One worked fine but wouldn't read discs the other wouldn't always turn on but had a good drive.

When i had it opened up i inspected it and noticed that the taller electrolytic caps around the CPU were bad. PSU and other caps were OK. So that's why it won't always turn on. M$ probably went with the same supplier as Dell did and these were made in the era of the capacitor plague. Considering this is a revised Xbox i can already tell it got cheaper caps. Launch x box still working no bad caps.

So any way any potential problems changing those to ceramic type?

I figure they aren't on an audio circuit...
Side note:
I already plucked the time caps or of these, they were dead anyway