Green screen on startup A4000 intermitant?

[Ross1]

Hi everyone, My A4000 is occasionally giving me a Green screen on startup. I re-seated the chip ram and cleaned the contacts but it still happens about 50% of the time.
Any other causes that you can cum up with?

[Ross1]

I replaced all the fast ram with ones I had laying around just to eliminate fast ram as being the problem (I dont have a spare chip ram) I get the green screen almost immediately when I power up (gray screen first for about one second) but it is not always as I said only about 50% of the time.
Its just strange.
Do you think I need to reseat something else?

[Ross1]

I've replaced the battery and there is no corrosion. I will have to play around some more. Thanks all for your suggestions.

[Ross1]

Well, the problem still persists, the strange thing is that if I leave it alone for about 2 min with the green screen showing it boots fine after that.