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Author Topic: A4000T not booting  (Read 2201 times)

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Offline X-rayTopic starter

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A4000T not booting
« on: August 11, 2011, 09:02:48 PM »
Yep, I am here asking you guys for advice about my A4000T, which doesn't boot.
I have been preparing it for sale to fitzsteve and going throught the drives, floppies, ZIPs etc to clean out persoanl data and format disks.

Everything was going fine yesterday: working CD, working hard disk with brand new OS3.9 boot, PPC running fine and all was good. Started putting all the zorro boards back in, starting with a DKB which went in fine.
After putting the PIV in slot 2, the Miggy would not boot, and that is how it has remained despite trying a lot of things:

Tried two different PSUs: one ATX with AT converter, one AT
Tried all three CPU cards: PPC, 060, 030. The machine powers up with all three, and responds to reset. On the 060 there is the familiar rainbow flash that you see every time you start. Tried different RAM on the 060 and PPC.

Tried two different disk modules, tried two different A/V modules.
Tried with and without the ports module.
Tried with floppy only, with no floppy and with various disks.
Took the mobo out of the case and looked for bad contacts, bad caps, broken traces. Can't find anything obvious.
Tried different SIMMs on the mobo
Cleaned all the zorro slots
Tried a different SCSI cable

So I am pretty much stuck. I haven't tried different CIAs as I don't think that's the cause. Not sure about that. They're socketed but will be difficult to remove.

Any ideas? :confused:
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Offline J-Golden

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Re: A4000T not booting
« Reply #1 on: August 12, 2011, 08:21:02 AM »
A better descrition of "won't boot" will go a long way!
 
Does the screen flash (other than the rainbow) any colors?  Power light flash?  Does it power up at all?  What about the floppy drive.  Does it click?
 
Since this happened when you installed the P-IV, have you checked that socket to make sure nothing got pushed into it with the card and maybe causing a short?
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AMIGA: (NOUN) THE FIRST COMPUTER THAT BRIDGED THE GAP BETWEEN HUMANITY AND TECHNOLOGY.
 

Offline Framiga

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Re: A4000T not booting
« Reply #2 on: August 12, 2011, 12:30:37 PM »
Quote from: X-ray;654107

Everything was going fine yesterday: working CD, working hard disk with brand new OS3.9 boot, PPC running fine and all was good. Started putting all the zorro boards back in, starting with a DKB which went in fine.
After putting the PIV in slot 2, the Miggy would not boot, and that is how it has remained despite trying a lot of things


DKB and PIV where installed in the same order before?

i would try to swap the 2 for testing purpose.
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Offline Crumb

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Re: A4000T not booting
« Reply #3 on: August 12, 2011, 01:06:35 PM »
Check out motherboard crystal oscillator, if it doesn't make good contact your machine won't boot.
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Offline X-rayTopic starter

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Re: A4000T not booting
« Reply #4 on: August 12, 2011, 09:35:42 PM »
Thanks for helping, mates (it is rather ironic I ask for help on my own  A4000T, because I used to be really good with this but have forgotten so  much).

J-Golden:

The symptoms are that the machine does power up and so do any drives that I connect. The screen goes a dark grey.

Framiga:

Yep tried different order and tried no zorro cards at all

Crumb:

I think it is something on the mobo also, will check that and get back to you.
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Offline Tension

Re: A4000T not booting
« Reply #5 on: August 12, 2011, 09:52:23 PM »
What happens when you hit the caps lock key repeatedly? Does the light stay on eventually? If so, it's something to do with the processor. Card loose perhaps?
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Offline X-rayTopic starter

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Re: A4000T not booting
« Reply #6 on: August 13, 2011, 10:15:48 AM »
Crumb, you beauty!
It was a loose crystal. Boots fine now, all the boards are back in and it has a clean OS3.9 install.

Thanks very much dudes!
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Offline fitzsteve

Re: A4000T not booting
« Reply #7 on: August 13, 2011, 10:26:44 AM »
Just spotted this thread - thats awesome news :)

I can haz A4000T now? :lol:
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Offline X-rayTopic starter

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Re: A4000T not booting
« Reply #8 on: August 13, 2011, 10:56:43 AM »
Yes u can, and it haz 547mb fast RAM for rendering cheese burger :lol:
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Offline fitzsteve

Re: A4000T not booting
« Reply #9 on: August 13, 2011, 11:04:30 AM »
Quote from: X-ray;654428
Yes u can, and it haz 547mb fast RAM for rendering cheese burger :lol:

Awesome :banana:
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