As for a 7200 atx conversion, I think im going to have to find a website that specifically tells me what to do to convert an atx psu.

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You'll need to confirm this yourself, but I am reasonably sure that the PS in the 7200 has the same pinout as those in the other "pro line" PCI Macs: the 7300, 7500, 7600, 8500, 8600 (?), 9500, 9600 (?). If you can find an ATX conversion for one of those (like this one - there are several more at the link previously provided), it should also work on the 7200, but as mentioned before, it's up to you to confirm they are in fact the same first.

i cant use the 7200s PSU because it doesnt even come close to fitting. I cant make it look hacked up.

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Well, that depends on what case you use, and how carefully you mod it. Does it really matter how the back looks? You're going to be doing some modding back there just on account of the ports and backplane.

I need a step by step conversion like there was for my car stereo. Connect Red to blue etc.

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I don't like your chances of finding one, but hey, happy Googling.

if a floppy from a mac clone (starmax) that has a face plate will work on a regular apple mac. both are autoeject and the cables look the same

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Probably then. If it was a PC floppy, the cabling would be altogether different.

Just out of interest, what StarMax model is it?

Also, it would help a lot with readability if you could use paragraph breaks please and thankyou.