Succes!
Upon removal of the daughtercard, I noticed some of what looked like corrosion on the solders joints of the connector and on some close by chips. Cleaned with a toothbrush, re-assembled and woot! It booted.
Then I went on to investigate the power button problem. Toying around in the Finder (System 7.1 btw) I noticed that clicking was acting like the shift key was held down. KeyCaps confirmed this, showing that the Shift, Option and Enter keys were always pressed. I removed the keyboard and trackball, plugged in an ADB kb and mouse and voilà, power button and everything else working just fine.
So now I'm on to finding a way to clean a most likely very dirty keyboard.
Thanks for the tips guys, it's appreciated.
Upon removal of the daughtercard, I noticed some of what looked like corrosion on the solders joints of the connector and on some close by chips. Cleaned with a toothbrush, re-assembled and woot! It booted.
Then I went on to investigate the power button problem. Toying around in the Finder (System 7.1 btw) I noticed that clicking was acting like the shift key was held down. KeyCaps confirmed this, showing that the Shift, Option and Enter keys were always pressed. I removed the keyboard and trackball, plugged in an ADB kb and mouse and voilà, power button and everything else working just fine.
So now I'm on to finding a way to clean a most likely very dirty keyboard.
Thanks for the tips guys, it's appreciated.