Commodore 128 Startup advice

I am messing about with a 128 and would like to ask for advice..... As
background, this computer has had some of it Memory chips replaced and it
boots fine in 128, 40 column config. I had to replace another memory chip
myself to enable it to boot into C64 mode without an Out of Memory Error.

It now appears to works fine in both modes as far as I can tell. I am used a
SD2IEC device to load programs etc.

It will run GEOS fine,in C64 mode.

Now to the issue.... if I boot (128 mode) from cold I sometimes get a
garbage screen (with green border). If I hit the reset button (or restart it
again) it will boot to the proper startup screen and work OK. If I have a
joystick plugged into Port 1 (after using GEOS and the Joystick to move the
mouse pointer) then I may have to do this a couple of times to get it going
then it seems to works fine after that.

This morning after being powered down overnight, it booted fine - this
garbage screen issue appears a little random!

It seems to boot directly into C64 mode with no problems if I hold the C=
down whilst powering on.

To address the startup issue

    Do you think I may still have a memory chip issue on the lower bank
(assuming C64 mode uses the other bank and works fine) - if so I will just
remove the old memory chips and replace with "newer" types ?
    Should I recap the board as the issues seem to be from cold boot ?
    Should I do both ?

Cheers



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