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iMac 17" A1173
The unit will not respond to any key commands, so I cannot zap the ram or force it to start up from an install disc. Do I need to replace the logic board or is there a way to reset the current one?
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First I would try a different keyboard before replacing the logic board.
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Try a "Safe Boot". At startup, hold the shift key down. This forces a directory check, disables fonts, moves font cache to trash, disables startup items, etc. Note that some features don't work in safe mode but you'll be able to continue troubleshooting.
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