Check the RAM itself. One of the modules may have bricked the system. If you heard a frying sound that's never a good thing. Check for any shorts under the board or in the RAM slot. Look for bent pins. Make sure nothing is touching or rubbing against any of the tracers to cause a short circuit. Look for any charring, melted or discolored PCB or solder traces or obvious frying out of transistors or capacitors on the board. Whatever it is it's effecting the system bus and/or the IO causing the boot loop. That usually doesn't ever end well. Might think about trying to find a slightly more recent board that you can transfer all your parts over to.