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Dead Mac LC475

Posted on 1998-07-02
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Last Modified: 2008-03-17
I have a "dead" Mac LC475. Specifically, no image on monitor (tried another monitor as well) and apparently no keyboard communication, ie Command-E will not eject floppy disk. Possibly booting up ok - chimes as usual. Hard drive appears to be running ok (also tried swapping internal drive with another known good one as well as attaching external drive.)
Hard to diagnose without looking at the machine, but suggestions would be welcome. Motherboard gone? Bios?

Thanks in advance for your suggestions

Stuart Tarbuck
Vancouver, B.C.
(josquin@portal.ca)
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Question by:Starbuck051297
5 Comments
 
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Expert Comment

by:Otta
ID: 1136849
It's a violation of the Expert Exchange "Customer's Agreement"
( http://www.experts-exchange.com/info/usrcntr.htm )
to post your E-mail address.

Guess: dead video card?


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Expert Comment

by:heacock
ID: 1136850
check the video card and get back to us.
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Accepted Solution

by:
sarky earned 100 total points
ID: 1136851
LC475's don't have a video  card do they??? Straight from the motherboard I thought.

Anyway it could be the motherboard but I would try the monitor on another MAC (known to be good) as (most) MAC's don't boot without a working monitor. If that is the case, get your monitor fixed and the problem should be resolved.  :)
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Author Comment

by:Starbuck051297
ID: 1136852
Sarky: Original monitor is working fine on another machine.

Otta:  Sorry - haven't used this forum for a long time; forgot protocol.

Seems like video might be the (obvious!) answer. Still a little worried that keyboard shortcut does not work...


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Expert Comment

by:mikhael
ID: 1136853
Starbuck: Have you also tried another keyboard and mouse? If you are not getting keyboard commands perhaps your ADB bus is shot...

Have you had any lightning around lately? Especially if you have a modem connected? Lightning surges can still get in via the power circuit.

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