Weird `````````````` effect

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Okay guys and gals I dunno if this is a hardware or software problem, but before I dismantle this A4000T I want to know if anybody had this kind of nonsense before:

I switched on earlier and the Miggy booted fine but when I went to move the mouse it was frozen. Keyboard also, couldn't CTRL Amiga Amiga. When I reset, I got all sorts of coloured screens, grey, blue, green, red, cycling through then black for 5 seconds then the familiar mutlicolour stripe reboot of the CS MkII. After that, no problem to reset or reboot, but now every now-and-then if I'm working with something that can take keyboard input, I get the ` typing by itself, it keeps on going until the line is full or until I press any key on the keyboard. I've checked and no keys are stuck, all connections into the tower secure.

What the hell is this?

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he he no, its ironic I was just saying on another thread how somebody blew both my CIAs about 5 years ago and how I had them both replaced, and no trouble from them at all since then.

No, this has been my Amiga all along, since 1996. I hope this isn't a CIA problem. Is this ```````````` a typical CIA problem?

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Come on gents, give me a little credit, I tried the keyboard. Its not that. In fact it happens even if the keyboard isn't plugged in.
I'm beginning to think this is a software problem

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Just got even more weird....I now have the dubious pleasure of seeing the purple screen with the disk, after all these years...
Right, that means I gotta open the old girl up.

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You guys have been a great help, I dismantled the whole thing and took the CS out and reseated all the simms. So I now have got rid of the weird screens on startup, and also the weird phantom key presses, but I have now swapped one problem for another:

The left mouse button no longer works...interestingly it clicked once when I launched a program from a Toolmanager dock, but hasn't worked again. Tried a different mouse - same deal. This is getting frustrating, chaps. I suppose I had better open it again and run it open (feel which CIA gets hot if any). I dread another CIA being bust.
It would be a shame if I couldn't fix it because I have held onto this Miggy for all these years and have been proud that it all still works.
While I'm checking it again: does anyone know where I can send the mobo to if indeed I do need a new CIA chip?

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Castellen

I think that's a great idea, providing sockets for future CIA chips. If the french guy can't do it, I'll send it to you (assuming I can't find the problem). Can you pm me some contact details and an idea of cost? Weird thing is the joystick button DOES work and I thought that a left button failure is only a CIA problem if the joystick fire button is also dead. Am I wrong about this? If I'm not wrong, any suggestions about what else it can be, because I can't see anything wrong here physically.
BTW the ```````````business has stopped (at least for today).

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Yup, but my keyboard is being a very good girl. She wasn't responsible for the original ```````````. It happened even with the keyboard unplugged.
Anyway I have made my problem different somehow by dismantling the whole lot....now its all good except for the left mouse button.
Hey, does that mean that it can't be a CIA problem, if the symptoms have changed?
(Reaches for Scully and Mulder's phone number)