I think the blue error screen means there is a problem with one of the custom chips. The good news is that the custom chipset inside the A1000 is socketed so the chips can be reseated, cleaned or replaced.

I would first remove any expansions such as ram upgrades and external floppy and HD drives and just check one of those isn't the cause.

If it still does it then you will need to take the A1000 apart and remove each of the custom chips carefully, give then a light clean with some electrical cleaner and then try refitting them. Hopefully it is just a bad socket connection causing the issue.

But failing that, you can get replacement custom chips from various sources if needed.