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Had the same problem with this 1221 card and the ACA500+
The trick with the 2 à 3 mm helped here but it's not the perfect and best solution.
A very light tap against the 1221 and there is a good chance that you will get a black screen.
In the meantime I bought a plexi housing for the Aca500+, now let's hope when this is built in with the 1221 I don't get a black screen ...
Didn't test with my A1200, don't want to pull out the Blizzard 1230 IV
This sounds very much like a contact problem - please clean the ACA500plus edge connector with alcohol and a micro fibre cloth (don't use contact sprays!), and the other side with alcohol and an old toothbrush. Again, don't use contact sprays, as they contain lubricants for potentiometers. IPA should be available in any pharmacy around the planet, and that's perfect for cleaning these contacts. You'll be surprised how "black" the micro fibre cloth will be, depending on the air pollution in your area.
Looking in the edge connector for the ACA1221 the pins do look very recessed in the plastic guides, could it be they are not protruding enough to make contact. Is it worth trying to bend them out a little?
These connectors have a guaranteed force of 15g per contact pin. If you start bending things, you may not improve it, but break them for good.
You should really try to pull it back a little, and maybe put a support under the card if you're using it on the ACA500plus.
You might want to take a picture of the connector - maybe your A1200 does not have a chamfered edge and the connector got damaged there. If the pins are really pushed back, the only chance is a new connector.
This is my best solution and still works.
On the left side of the card I pull back about 2mm and on the right side about 2.5mm.
It works for the last 2 weeks. A support under the card helps also.
Now have to be very carefull 😬 when I build it in his plexi house.
"a couple" won't do the trick - a single pin not making contact can break functionality. Please take a picure of the connector, looking inside where the card edge is inserted.
Just out of curiousity: What model are the two power supplies you've tried?
I suspect that we'll ahve to take a look at the card here. Please read this article before sending anything back.
the A-Power one from amiga store EU
...is known-bad and should not be connected to any machine that has any more hardware in it other than the naked machine. Please read our Power supply FAQ for more details - the A-Power PSU has been sold to you with false advertising. It is not suitable for an Amiga. You should return it for a refund.
QuoteI would buy from you but I think your out of stock.
Select 110V model, then 220V model again and you can order - it's a rather annoying bug in the shop system
There is no way to tell this from remote, of course 
But we had a lot of customers where problems could be be tracked down to bad PSUs (which is why Jens designed his in the first place) so there is a good chance it is.
Thank you Tobias, I'll wait for the new PSU to arrive and then go from there
I'm now running an ACA 500 with a 1221EC accelerator. I recently replaced my original PSU with the icomp CA-PSU and it solved all my stability problems. I also recommend the acrylic case from plexilaser.de to keep everything safe (and neatly route an ECSv2 VGA cable if you have one of those).
If you do get a case it's best not to place the CA-PSU on top of it. I absent mindlessly did that blocking the air holes and radiatated heat into the plexi case - it didn't crash but it did feel warmer than usual so I won't do it again 
The last reply was more than 365 days ago, this thread is most likely obsolete. It is recommended to create a new thread instead.
