>Hi,
>As a beginning thanks to all that helped from my precedent posts...
>Speaking of, in answer to one of my last post re 7300/180 trouble at
>start up (chime-HD scratching-know good monitor black screen-that's
>all) and after much RAM HD & CD rom messing-cuda-power & PRAM reset,
>someone (sorry do not remember who :-( ) told me to disconnect both
>HD & CD and to try booting from the floppy drive only. This I did
>with OS 7.5 and nothing happen, I mean nothing ie floppy do not spin
>at all. Since the fellow that told me to try that trick seems to be
>meaning that if the floppy test was bad, then the logic board was
>probably dead, I stopped messing around with the 7300/180.
>Now I have been giving a 7200/120 and guess what? Chime-HD
>scratching- monitor screen black!
>After the usual tests (PRAM-RAM...), I tought i would try the floppy.
>So I disconnected both the HD & CD drive and tried starting on OS 7.5
>on floppy. Nothing no floppy spinning.
>So I guess that I would ask: is the floppy test a good one to
>determine if logic board is bad? If not, anyone care to give a step
>by step suite of things to do to determine when and how can a logic
>board be declared dead.
>Thanks,
>JCT (beginning to be tense when I start my iMac :-)
Is it a mac monitor or one with an adapter and what size and res is
it? Is the vram onboard (if so how much?) the mobo or on a pci card? How
much ram is in the slots? Is the cache onboard? (bad cache will give a
black screen) What happens after the scratching of the HD? Does it
scratch for quite a while as though the system is loading?
If it chimes the processor should be ok. Have you got a startup cd?
I bought a 8200/120 and put a 8500 mobo in it and had the same problem -
no video - cured it eventually though.
Pete
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