68kMLA Classic Interface
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| Click here to select a new forum. | | Problem with MDD FW800 and Studio Display | Posted by: Jaycen on 2011-10-25 19:09:44
I have searched the web and looked in many forums and haven't found a problem remotely like the one I’m having.
The problem is with my MMD FW800. It’s a dual processor running at 1.25 GHz with two 80 GB hard drives. The first hard drive has Tiger installed and the second has Leopard. The problem is that when I have a studio display connected it will either not boot or boot into open firmware. Also with the studio display connected, the computer will give a long tone before the initial bong you get when starting up.
If I connect a normal monitor, I’m connecting a Compaq flat panel., the computer boots normally with no problems whatsoever.
I don’t have any USB connections to the monitor, though I have a wireless mouse connected to the keyboard USB.
Things I have tried:
Resetting the Pram
resetting the nvram
resetting open firmware
Any ideas would e greatly appreciated. Oh one other thing. When i first started using the studio display everything worked with no problems. This not booting or booting into Open firmware came on suddenly.
| Posted by: Byrd on 2011-10-25 19:55:54
Just to clarify, what is the studio display? It's not an ADC model, is it?
| Posted by: Jaycen on 2011-10-26 00:13:29
Yes the studio display is the first monitor that apple used ADC.
| Posted by: Byrd on 2011-10-26 02:40:56
Noting that the MDDs have terribly unreliable power supplies (that can get progressively worse over time with erratic voltages), it could be a possibility that the ADC display, drawing all its power from the MDD, makes it fall over when plugged in. The other thing is the graphics card - which model is it? Can you try another ADC graphics card? Remember that the Apple AGP graphics cards have special connector providing +28V for ADC power, which a standard VGA display does not use - this is the difference.
I'd try disconnecting things like your HDs, optical drive, remove any additional PCI cards, external peripherals etc. to lower the load on the power supply - then plug your ADC display in. Also try blasting any dust out of the AGP slot, and clean the connectors on your graphics card (you can use an eraser).
Interestingly, I found this link while researching ADC which details modding the display for standard DVI signal + use an external 24V power brick:
http://forums.bit-tech.net/showthread.php?t=188336
JB
| Posted by: Jaycen on 2011-10-27 11:03:43
DId the suggested clean out and it seemed to fix the problem but then it came back. However I did manage to get some more info when the computer booted normally. Apparently the problem started after the computer had a Kernel Panic.
So I'm going to get a different Graphics card and see if that fixes the problem. If not I'll take a closer look at the power supply.
I'll let you know how it all turns out.
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