Sorry to do a bit of thread necromancy, but I was unable to work on the Miggy for a while as we had relatives round and I had to just leave the Miggy under the old dustcover from our 500 and forget about it. Anyway it transpired that the ROMs (or EEPROMS) work fine, I have no idea what the problem was still, but a few days ago I heard the drive-click while I was surfing the net on my PC, turned out I'd left the power on from an attempt the day before to get the Miggy functional again and through no effort my own it was now working, I plugged in the monitor and turned it on to see the purple boot screen with 3.1 ROM version 40.so on.
I then turned it off, closed up the case and screwed it all together, plugged the power and monitor back in and - nothing. Wouldn't boot, except now it would power up but the power light flashed and the screen displayed a single colour, sort of yellowy-greenish (I understand those one colour screens are an error message but I don't know what yellow means). Anyway, I again took the case apart and turned it on again, getting the boot screen perfectly normally, I came to the obvious conclusion that in shutting up the case I must have caused something inside to be pressed against something it shouldn't be pressed against, I screwed the case together while the miggy was on - VERY gently and carefully and it's worked fine since, installed Workbench 3.1 from the disks fine.
Anyway, it's caused not a single problem since, but from what you guys say I could end up with blank ROMs sooner or later, should I open it back up and cover up thw windows? It never comes into direct sunlight - during the day I either keep it under the dustcover, or if I'm using it then close all blinds in the room it's in to avoid sunlight contact with the plastic (I've read this is a cause of the yellowing that afflicts old computers but don't know if it's true, still I'm not taking chances)
Also, I'm suspicious that the metal shield may have been the reason for the problems I had, what exactly does it do? Can anyone give a brief explanation of why it's needed?
