PowerMac G3 Beige lost second monitor
Dear community, I have a severe problem with my Power Macintosh G3. I have been using two monitors with extended desktop view, when suddenly the second monitor stopped responding on startup. Below is my setup:
- Power Macintosh G3 Beige Rev.1 (1997) with 266 MHz processor
- OS 9.0.4
- Graphic card/input #1: ATI 3D Rage II+ (motherboard) DB-15 (Apple) input
- Graphic card/input #2: IxMicro Twin Turbo 128/M2 DB-15 input with driver number not know, But I assume it's not the latest 4.06. Installed on the lowest PCI input, which I think is the 33 MHz slot. One other slot is in use with an amplifier. AGP slot is also connected with the original video input/output, but is not being used.
- Display #1: Apple Multiple Scan 720 Display M4552
- Display #2: FIMI MGD403NTR MD0709BRM gray scale medical monitor
So, the Apple monitor lights up as normal no matter which graphic card it is plugged in. The FIMI lights up only, if switched to the one Apple monitor was on at startup. If no monitor or only FIMI was plugged (either one of inputs), I cannot get any display signal to any monitor anymore, before restart. All possible sequences were tested on 832x624 75Hz 256 color mode for both graphic cards. I read from somewhere that too big a resolution could affect on monitors, but I don't know if the one used was the correct one.
I have acquired another Twin Turbo 128/M8A, which works similarly with same drivers without updating. No noticeable improvement. I have also:
- Tried safe mode (Boot+shift)
- Checked the extension manager (Boot+space), but couldn't find anything fishy.
- Zapped the NVRAM (Boot+Cmd+Opt+P+R)
- Reseted NVRAM from motherboard (small button next to the lowest PCI slot)
- Ran hardware test from OS 9 install disk (Boot+ C or D), this was mainly for hard drive I guess, nothing found
- Unplugged and changed the motherboard battery.
My questions are: Does OS 9 have somewhere preferences about opening voltage channels and keeping them open, since I cannot get signal from other card after startup? Could I have a bad capacitor somewhere (display, motherboard)? Is there any other magical tricks I could try before updating drivers and/or OS to latest 9.2.2 version?
I'm running some delicate software which I don't know if they'll work after these updates, so I have been careful about those to this point. Could they stop working after such update? What else would you try?
Thank you in advance for any tips and suggestions, I'm really getting desperate here.
null-OTHER, Mac OS X (10.0.x) or Earlier, Power Mac G3 Beige, OS 9.0.4