A1200 rebooting problems

[z36ra]

sounds like a PSU problem. Are you good with a soldering Iron?

Get a small screwdriver to depress the catch on the plug and slip the plastic cover back. Check to make sure that all the wires are soldered to their apropriate pins. The one that isn't will need to be soldered back in place. Slip the cover back onto the plug.
Simple.
I had a similar problem on one of my A500s

Tom (tweeks) knows a little more about that stuff: http://www.theweeks.org/toms-stuff/AMYHACKPAGE.html

Thats a new friend of mine in S.A. Tx.