jmacz
Well-known member
Summary: My Quadra 700 will not boot (stuck at no disk icon) when an Apple 16" Color Monitor is plugged into its monitor port.
Quadra 700: 68MB of RAM, loaded on VRAM, ZuluSCSI for internal drive, using on board video, AEKII with standard ADB mouse.
Apple 16" Color Monitor: I just finished recapping it (uh oh), the setup was working before the recap albeit with the monitor having multiple issues (hence the recap). The monitor has a built in DB15 cable.
What happens:
1.) Connect the monitor to the Quadra (built in DB15 cable from the monitor going to the Quadra's on board video).
2.) Power on the monitor (no issues), get a green light and can tell the monitor is powered on.
3.) Power on the Quadra.
4.) Get the boot chime.
5.) Monitor shows the usual gray screen (looks good).
6.) Monitor shows the mouse cursor.
7.) Mouse cursor moves when the mouse is moved, everything looks great.
8.) After a few seconds, the disc icon appears with the flashing "?" mark. It's not booting from the ZuluSCSI.
If I use a different monitor (Apple 13 RGB Monitor) with NO other changes, everything works great. Quadra boots from the ZuluSCSI with no issues. I have tried swapping keyboard and mouse, just in case. No change. I have tried swapping the ZuluSCSI with a standard hard disk. No change.
Basically, it won't work with the Apple 16" and I'm pretty sure it has something to do with the recap OR the reassembly after recap. But I can't for the life of me figure out how plugging in the monitor would impact the Quadra's ability to boot from its internal SCSI device.
How's the monitor?
Before recap, the monitor had a noisy display with very visible scan lines (it would ripple across the screen and you could see it with your bare eyes). It also had a creeping shadow appearing from the left side of the screen about a minute after turning the power on. The monitor was also dim.
After recap, as I'm looking at the gray screen with the question mark disk icon, the noise is gone. The visible scan lines are also gone. The shadow doesn't seem to appear anymore. And the monitor is brighter, looks sharper, and overall looks great!
Investigation
I found a link to the DB15 pinout to see if there's anyway one or more of the pins could be causing the Quadra to be unable to boot from SCSI. The link is here:
Looking at the 15 pins, I would think that most of the pins are working properly given I see a gray, focused screen, with cursor movement which is crisp, with no blue, red, or green tint of any kind. No sync issues. No geometry issues. I'm not sure how any of these pins could be causing the SCSI issue.
Any thoughts?
Quadra 700: 68MB of RAM, loaded on VRAM, ZuluSCSI for internal drive, using on board video, AEKII with standard ADB mouse.
Apple 16" Color Monitor: I just finished recapping it (uh oh), the setup was working before the recap albeit with the monitor having multiple issues (hence the recap). The monitor has a built in DB15 cable.
What happens:
1.) Connect the monitor to the Quadra (built in DB15 cable from the monitor going to the Quadra's on board video).
2.) Power on the monitor (no issues), get a green light and can tell the monitor is powered on.
3.) Power on the Quadra.
4.) Get the boot chime.
5.) Monitor shows the usual gray screen (looks good).
6.) Monitor shows the mouse cursor.
7.) Mouse cursor moves when the mouse is moved, everything looks great.
8.) After a few seconds, the disc icon appears with the flashing "?" mark. It's not booting from the ZuluSCSI.
If I use a different monitor (Apple 13 RGB Monitor) with NO other changes, everything works great. Quadra boots from the ZuluSCSI with no issues. I have tried swapping keyboard and mouse, just in case. No change. I have tried swapping the ZuluSCSI with a standard hard disk. No change.
Basically, it won't work with the Apple 16" and I'm pretty sure it has something to do with the recap OR the reassembly after recap. But I can't for the life of me figure out how plugging in the monitor would impact the Quadra's ability to boot from its internal SCSI device.
How's the monitor?
Before recap, the monitor had a noisy display with very visible scan lines (it would ripple across the screen and you could see it with your bare eyes). It also had a creeping shadow appearing from the left side of the screen about a minute after turning the power on. The monitor was also dim.
After recap, as I'm looking at the gray screen with the question mark disk icon, the noise is gone. The visible scan lines are also gone. The shadow doesn't seem to appear anymore. And the monitor is brighter, looks sharper, and overall looks great!
Investigation
I found a link to the DB15 pinout to see if there's anyway one or more of the pins could be causing the Quadra to be unable to boot from SCSI. The link is here:
Apple Vintage Mac Monitor Connections
www.retrotechnology.com
Looking at the 15 pins, I would think that most of the pins are working properly given I see a gray, focused screen, with cursor movement which is crisp, with no blue, red, or green tint of any kind. No sync issues. No geometry issues. I'm not sure how any of these pins could be causing the SCSI issue.
Any thoughts?
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