@Lurch Both of my A1200's basically did the same thing over the course of a few years. Long story short, the first thing I thought might be malfunctioning was an add-on. The AT-A1200 in my sig (with a FastATA) first started freezing up when cold. The longer it was on, the more stable it became. But, then after more time passed, the more erratic it became. I just put it aside for a year or so after that.
Next, ahhh, I have another A1200 - good for me! It has a 1B motherboard. Equipped it with an ACA accelerator, Indi MKII, and USB. It started acting up by not allowing the Indi to initialize correctly. All else worked ok but it was just unusable with the Indi problem.
So, yup, I had to come to the realization that I gotta tear these both apart and determine which add-on is malfunctioning. After getting them both apart and stripping them bare and testing with no or swapping add-on's it became clear that both motherboards were the culprit.
The AT-A1200 has a bad CPU and/or RAM. Finally figured this out by getting (after about 8 hours of fiddling) it to FINALLY show me some screen error codes - yellow and sometimes black.
The A1200 - 1B culprit is malfunctioning on board video (I even recapped it! - Arggg). The RGB doesn't give a proper signal and therefor would not initialize the Indi MKII correctly. This is a big difference between the MKI and the MKII.
So, I swapped in the Indi MKI into the 1B mobo and that Indi unit doesn't care about initialization from the mobo and therefore works correctly. Of course RGB is still horked. So, that's the A1200 I'm currently using and at least one is working for now.
In conclusion, It seems to me that the more add-on's you connect to an A1200 - the more current is pulled thru the system and the more likely for a premature motherboard malfunction. A1200's just seem fragile to me. Now, most all my (pricey to me) add-on's are back in there original boxes tucked away for now. I would love to get my AT-A1200 mobo repaired but that's just not in the stars at this time and sending to AmigaKit would cost a small fortune (especially if I sent both for repair). The 1B is working for now so... I'm not desperate at this point LOL.
So anyways, I feel your PAIN!
I'm having lots of fun building my A2000 Toaster system at this time anyhoo - so, that's feeding my Amiga addiction for now! :lol:
