amiga 4000 not displaying picture

[amiga4000freak]

hello

whats happening is when i boot up showing disk insert its ok until i move the mouse in either port it will go off into a grey screen and it will reset itself eventually showing error code

[Karlos]

hello

whats happening is when i boot up showing disk insert its ok until i move the mouse in either port it will go off into a grey screen and it will reset itself eventually showing error code

Umkay, that doesn't sound at all good. Mouse movement shouldn't just crash the system, especially whilst you are just on the "insert disk" screen.

Ropey CIA chip I wonder?

[amiga4000freak]

where are they on motherboard m8

[Karlos]

where are they on motherboard m8

Sadly, unless you are well versed in replacing surface mount components, knowing that isn't going to help.

The CIA chip being at fault was a wild stab in the dark anyway. Right now I'm fresh out of ideas, except for one (now that you can boot it at all).

Power down the machine completely.
Hold down both mouse buttons and keep them held.
Power up the machine whilst holding down the mouse buttons and wait.

Do you get to the "Early startup" screen, and if so, does using the mouse cause any problems then?

My thinking here is that perhaps some really dodgy patch messes up some resident component of your system such that every boot except the first one has a problem.

[amiga4000freak]

hi

It boots into a start up control but the mouse pointer wont move and im getting a couple of lines when i move the mouse around

[Karlos]

hi

It boots into a start up control but the mouse pointer wont move and im getting a couple of lines when i move the mouse around

You mentioned you'd tested the mouse in both ports, so I have to ask, is it in the regular one?

[amiga4000freak]

yes m8

[Karlos]

yes m8

The lines that you see when you move the mouse around. Are they just random corruption or does it look like it could be the mouse pointer, but just smeared across the screen? For example, does the position of the lines vary systematically as you move the mouse around?

Perhaps the sprite hardware is borked.

I'm starting to grasp at straws here. Hopefully another user can step in and offer some suggestions.

[amiga4000freak]

yes m8 whem i move the mouse the lines move around more and i cant boot up unless i connect there mouse into the port

[Karlos]

Actually, you can.

You can use the Left-Amiga key in conjunction with the cursor buttons to move the mouse pointer around the screen. Still holding the Left-Amiga key and pressing the Left-Alt button will issue a left-click...

[amiga4000freak]

its not letting me move the mouse cursor its toggling between pal and ntsc mode when a press any button on the key board

[Karlos]

its not letting me move the mouse cursor its toggling between pal and ntsc mode when a press any button on the key board

Ah. Actually maybe the feature doesn't work on the Early Startup screen. It certainly works after you boot, even if you boot without a startup-sequence.

To be fair, it has been a while since I ever used an Early Startup screen that wasn't routed through my graphics card.