Thanks for that. I did a bit more digging online and I think you're right.
I've opened up the unit and taken out the PSU/Drive assembly and I do suspect it's the battery that's the issue.
The battery itself doesn't look too bad on first inspection but I think I can see corrosion on the board - the dark stuff around the battery.
Am I right in understanding that is corrosion? Did you see that on yours?

Also the CPU switcher I mentioned is actually a ROM switcher.
I have found the 68030 that I was thinking about and it was for an old Amiga 500 that I sold many years ago. For some reason I kept the 68030 - a mega midget racer. Still have the manual as well 

Thanks again.

Hi all,

First post and it might be a long(ish) one - sorry in advance!
I've recently retired and one of my first jobs was to sort out my loft where I have hundreds of Amiga, PC and Amstrad games.
I have two Amigas - neither of which had been switched on until recently for maybe 20 years.

The Amiga 1200 powered on first time, connected to a 1084S monitor and booted up the Colonel's Bequest no problem.
After trying a few disks for maybe 10 minutes the 1084S blew (white light and now won't power on).
I'll probably sell that for spares at some point, as I no longer see myself as someone who's going to fix the thing.

So I'm now onto a backup video a solution - I bought a Linkfor SCART to HDMI converter and an Amiga to SCART lead.
This is linked to to an ASUS VP28U monitor. This displays fine on the A1200 and I'll use it to test the games.

Now onto my problem...
I also brought down the Amiga 2000. I've had this from new and I modded it a bit back in the day - it has a 68030 in it from memory, with a nice switch hanging out of the front to change from 68000 to 68030 (I think). It was some kind of boot rom - a long time has passed and my memory is hazy on it.
I connected it up in the same way as I did the 1200. The 2000 powered on fine and I can see the video output on the Linkfor 'change' - it's trying to display something but no discernible image appears.
I've tried the different resolutions that the Linkfor allows - tried changing from PAL to NTSC, switched off and on a few times but can't get it to display anything.
Fan is whirring in the 2000 and the power light is on, but nobody's home.

Does anybody have any idea what the difference could be here between them?

Thanks a lot.

I requested this back in July 2024 (see thread linked below) and amigakit said "we will look into implementing it in a few weeks time", but I guess it was forgotten / other more pressing things took priority.

https://forum.amiga.org/index.php?topic=76648.0

Implemented this today and is with testers now...

I have 2 A1200s and on both, the BLIZZARD IV 123050MHZ doesn't work. I also changed the power supply. I tried the BLIZZARD only with the CPU only, only RAM, only COOPROCESSOR but always a black screen and no IC or CIP gets hot or warm....they all stay cold.

Hang on, this is getting confusing.

Forget the Blizzard card first, pointless doing any tests until you know you have a working A1200 motherboard.
You said earlier, that the A1200 does not boot even without blizzard. You just get a yellow screen.
Now you say you have 2x A1200's and blizzard does not work on either?

Your going about this all the wrong way, so to clarify.

You have 2x A1200 computers fully working?

  GParted very helpfully allowed me to stretch the 64GB image to make use of the extra space. Save, done.  Shove back in A1200NG or A600GS whatever and boot.

The main System Menu will detect if a cards partition is smaller than the sdcard size and offer to resize it on next reboot.