In looking for a repair manual - fearing I'll need to solder a battery or two - I found this:
http://www.apple-collection.com/CarPos/macintosh_ii.iix.iifx.pdf
It's a nice quick ref. repair manual for those 3 models with mostly helpful diagrams. Page 19 of the PDF has my problem on it and my next step appears to be trying another video card (dagnabbit - I'm still waiting to borrow a meter to test the batteries, too).
Here's the text:
Troubleshooting Symptom Charts/Video
Screen is black, audio and drive operate, fan is running, and LED is lit
1 Adjust brightness on monitor.
2 Verify monitor works with another Macintosh.
3 Replace monitor. Refer to appropriate monitor manual to troubleshoot defective monitor.
4 Replace video cable.
5 Move video card to different slot.
6 Replace video card. Refer to Video Cards manual.
7 Replace SIMMs.
8 Replace logic board. Retain customer’s SIMMs.
9 Replace power supply.
Know where I can get a cheap video card (approx. $10)?
http://www.apple-collection.com/CarPos/macintosh_ii.iix.iifx.pdf
It's a nice quick ref. repair manual for those 3 models with mostly helpful diagrams. Page 19 of the PDF has my problem on it and my next step appears to be trying another video card (dagnabbit - I'm still waiting to borrow a meter to test the batteries, too).
Here's the text:
Troubleshooting Symptom Charts/Video
Screen is black, audio and drive operate, fan is running, and LED is lit
1 Adjust brightness on monitor.
2 Verify monitor works with another Macintosh.
3 Replace monitor. Refer to appropriate monitor manual to troubleshoot defective monitor.
4 Replace video cable.
5 Move video card to different slot.
6 Replace video card. Refer to Video Cards manual.
7 Replace SIMMs.
8 Replace logic board. Retain customer’s SIMMs.
9 Replace power supply.
Know where I can get a cheap video card (approx. $10)?