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PowerMac G4 always defaults to ADC port
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Clinically Insane
Join Date: Dec 1999
Status:
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I have a 400MHz G4 tower with an AGP Radeon (32MB) video card. I also tried the Rage Pro video card. In both cases, even when a VGA monitor is connected, the computer boots defaulted to the ADC port (where nothing is connected.)
Comes up as a blank screen, of course. I can have the computer go to sleep, then wake it, and it'll come up on the VGA screen. Rebooting keeps it on the VGA screen. However, if I shut the computer down, it'll come up on the ADC port all over again.
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"…I contend that we are both atheists. I just believe in one fewer god than
you do. When you understand why you dismiss all the other possible gods,
you will understand why I dismiss yours." - Stephen F. Roberts
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Administrator  Join Date: May 2000
Location: California
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Is there an adapter plugged into the DVI port? ADC came out well after those cards were designed.
In the Monitors/Displays control panel, check if the Arrangement tab is available, indicating the computer is seeing multiple monitors. If so, you could work around it by turning on display mirroring.
On the other hand, a PRAM reset might solve all problems.
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Clinically Insane
Join Date: Dec 1999
Status:
Offline
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I tried PRAM reset and checking the Monitors control panel, but it didn't indicate it had a second monitor attached.
It's really weird. I might try putting a new battery in.
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"…I contend that we are both atheists. I just believe in one fewer god than
you do. When you understand why you dismiss all the other possible gods,
you will understand why I dismiss yours." - Stephen F. Roberts
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Moderator  Join Date: Apr 2005
Location: Cambridge, UK
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Offline
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An interesting issue with my Quicksilver at work is that it won't power on with the DVI > VGA converter connected to the DVI port. If you feel like jumping around, try powering your machine on, then connecting the monitor to see what it does.
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Administrator Join Date: May 2000
Location: California
Status:
Offline
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At this point, I'd vote for an OS or OS preference corruption. Try booting from the Install CD, see if everything comes up normally.
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Clinically Insane
Join Date: Dec 1999
Status:
Offline
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I don't remember if it booted correctly from the CD. I'll see what happens. It's a fresh install of OS 9, though.
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"…I contend that we are both atheists. I just believe in one fewer god than
you do. When you understand why you dismiss all the other possible gods,
you will understand why I dismiss yours." - Stephen F. Roberts
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