Amiga 3000 driving me crazy

[magnetic]

The fast cpu slot on a3000/4000 can cause failure if boards have been plugged and unplugged alot or through shipment/ torqueing boards etc.

Are you sure your psu is ok? I'm saying that because you mention the gfx board having problems too?

[magnetic]

Just re read your post Green screen afaik is the agnus chip.

[magnetic]

Alot of times its not the cpu slot is dirty its that from wear and tear its not making enough contact with the cpu card. In this case it needs to be replaced. I highly doubt cleaning it with IPA will fix it...

[magnetic]

Perhaps the capacitors are failing in the power supply and the voltage and or current isn't stable. Are the system temperatures under control? Some old analog video equipment I have and maintain is difficult to run unless the power at the outlet is stable too.

I agree with you sounds like psu problems cleaning the slot prolly isnt going to help.