Screeching Noise & Screen Gibberish
Tanya Katz
tanya at adds.newyork.NCR.COM
Sat Nov 11 02:24:53 AEST 1989
In article <12336 at fluke.COM> Craig Johnson writes:
>What exactly was screeching? This is terribly important to answering
>your question. Possible sources are, the hard drive, the monitor, the
>power supply, and the speaker. I'm going to guess it was the power
>supply.
Just to recap my opening remarks in <12324 at adds.ncr.com>:
>>On Sunday Morning, about 7:30 am, just after my husband complained
>>that I left the computer on and it was "noisy," tfk, my home machine
>>must have taken offense to his remark, because it started to emit
>>a high pitched whine.
As best I could determine, the screeching sounded like it was coming from
the terminal itself. The unix-pc case was cool, especially around the disk
and fan areas. The only keyboard response was to the first character
to turn on the screen display. I couldn't shutdown and nothing else was
being echoed by the driver. The screen display looked like garbage.
>The scrambled display is indicative of a processor which has lost its
>mind (due usually to misread opcodes), or a video memory which has
>suffered a power hit. In either case, a sagging Vcc (5 volt supply) on
>the motherboard will cause this kind of nonsense. I'm suspicious that
>your power supply experienced a brownout, either because the AC main
>had a problem or because the power supply itself is failing. Further,
Brownout definitely crossed my mind.
>If it ran in this mode very long, its possible that the power supply
>overheated some of its components. I would be suspect of its long term
>reliability. Now would be a good time to get a spare power supply from
>Halted Specialties if you haven't already. [thanks Thad, I've got mine]
Would you post or email me the address and/or phone number of this supplier?
>Well, I could be all wrong about your problem Tanya, but this is at
>least one good possibility.
Thanks for the input. I am receptive to all possibilities.
I have booted the machine several times since last Sunday, and it
has been fine. But I'm cautious...
-Tanya
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